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Buyer protection · 5-layer check

Sealed LEGO authentication in 5 layers.

Five checks to authenticate any sealed LEGO box before you wire money — raking-light inspection, AI reseal detection, slab cert verification, comp cross-reference, and 360° video. Combined cost under $5. Combined catch rate over 99%.

Authenticate a box free →Reseal tells reference
⊙ Quick answer

What is sealed LEGO authentication?

Sealed LEGO authentication is the process of confirming a box marketed as factory-sealed is genuinely original — not opened, not resealed, and not counterfeit. The five-layer authentication stack is: (1) raking-light inspection for the eight reseal tells, (2) AI reseal detection via BrickGauge at 97.4% recall, (3) slab cert verification on CGC / AFA public databases for graded sets, (4) comp pricing cross-reference on BrickEconomy and Heritage sold listings, and (5) 360° video confirmation for transactions over $2,000. Total combined cost under $5; combined catch rate above 99% on confirmed scams.

Layers
5
AI recall
97.4%
Total cost
Under $5
Catch rate
Over 99%
The 5-layer stack

The complete sealed LEGO authentication checklist.

Run all five layers on any sealed LEGO transaction over $500. Each layer catches a different scam vector — together they cover the full attack surface.

01 · Raking light

Visual reseal tells

Inspect the seal sticker at 30° under a single light source. Adhesive bleed past the boundary, double-pass marks, off-axis rotation. Catches obvious reseals.

  • ↦Time: 2 minutes
  • ↦Cost: $0
  • ↦Recall: 80–85% of reseals
02 · AI reseal model

BrickGauge pre-grade

Upload six photos. AI returns reseal-confidence score and six-axis condition report. Catches what raking light misses.

  • ↦Time: 38 seconds
  • ↦Cost: 2 scans free
  • ↦Recall: 97.4%
03 · Slab cert

CGC / AFA database

For graded sets only. Verify the cert number on the grader's public lookup. Counterfeit slabs exist — never skip this step.

  • ↦Time: 30 seconds
  • ↦Cost: $0
  • ↦Catches counterfeit slabs
04 · Comp pricing

BrickEconomy + Heritage

Cross-reference asking price against actual sold comps. Inflated 'sold' listings on social marketplaces are a coordinated shill tactic.

  • ↦Time: 5 minutes
  • ↦Cost: $0
  • ↦Catches shill pricing
05 · 360° video

Pre-payment confirmation

Demand a 360° video of the box (and slab if graded) before payment. Sellers who refuse are not legitimate.

  • ↦Required for $2,000+ transactions
  • ↦Use escrow when possible
  • ↦No video, no deal
✓ Combined

Over 99% catch rate

The five-layer stack catches over 99% of confirmed scam attempts on sealed LEGO. Total time: 10 minutes. Total cost: under $5.

The scam landscape

What sealed LEGO authentication actually protects against.

Five real risks in the sealed LEGO market: (1) resealed boxes sold as factory-sealed, (2) counterfeit AFA / CGC slabs on raw boxes, (3) fake ‘guaranteed-grade’ services, (4) shill comp pricing on social marketplaces, and (5) kickback-claim ‘insider’ expediting scams. The 5-layer authentication stack covers all five. Read the full LEGO grading scams reference for vector-by-vector detection.

Start with the free AI layer

BrickGauge authentication in 38 seconds.

Upload the seller’s six photos. The AI returns a reseal-confidence score, calls out the indicators it detected, and gives you a SEND / MAYBE / HOLD / SKIP verdict on the box. Two scans free on signup, no credit card. The single highest-ROI authentication layer.

Authentication cluster

More on sealed LEGO authentication.

How to tell if a LEGO is resealed
8-point reseal check
Read the guide →
Resealed LEGO tells
Definitional reference
Read the guide →
Reseal vs factory seal LEGO
Side-by-side visual
Read the guide →
LEGO grading scams + risks
All five vectors
Read the guide →
MISB LEGO grading
Mint-In-Sealed-Box explained
Read the guide →
Seal damage grade impact
Why seal matters most
Read the guide →
Authentication FAQ

More on sealed LEGO authentication.

↦How do I authenticate a sealed LEGO set?

Five layers. (1) Inspect the seal sticker under raking light for adhesive bleed, double-pass marks, and off-axis rotation. (2) Cross-reference seller photos against the BrickGauge reseal model (97.4% recall). (3) Verify any claimed slab cert on the grader's public database. (4) Cross-check asking price against BrickEconomy and Heritage sold comps. (5) Demand 360° video before any transaction over $2,000.

↦What is sealed LEGO authentication?

Sealed LEGO authentication is the process of confirming a box marketed as factory-sealed is genuinely original-factory — not opened, not resealed, and not counterfeit. Authentication covers seal integrity, reseal indicators, slab cert verification (for graded sets), and contents authenticity (via reseal detection, since graders don't open the box).

↦Can BrickGauge authenticate a sealed LEGO box from seller photos?

Yes — upload the seller's six photos and BrickGauge returns a reseal-confidence score, a six-axis condition report, and a SEND / MAYBE / HOLD / SKIP verdict. 97.4% reseal-detection recall against confirmed resealed boxes. The single best buyer-protection layer for sealed LEGO transactions over $500.

↦How do I verify a graded LEGO slab is real?

Cross-reference the certification number on the grader's public database. CGC: cert lookup at cgccollectibles.com. AFA: lookup at afagrading.com. Counterfeit slabs exist — always verify the cert number even if the slab looks legitimate. Inspect the slab seam under bright light for glue lines, and confirm the printed fonts match the grader's current style.

↦What does sealed LEGO authentication cost?

BrickGauge pre-grade: two scans free on signup, then $1.50–$2.90 per scan with credit packs (never expire). Slab verification on CGC / AFA databases: free. Professional in-person authentication services typically charge $50–$150 per set. For high-value transactions ($5,000+) consider both — AI pre-grade as a first filter, professional inspection as final confirmation.

↦Should I authenticate a sealed LEGO set before buying?

Yes, for any transaction over $500. The cost of authentication ($0–$5) is trivial compared to the risk of a $4,000 resealed Cafe Corner. Run BrickGauge first as a no-cost first filter; escalate to professional authentication only when (a) the AI flags MAYBE confidence or (b) the transaction exceeds $5,000 declared value.

↦How do AFA and CGC authenticate sealed LEGO?

Both graders inspect the box exterior, seal sticker, and seam without opening the box. They check for reseal indicators, condition issues across six axes, and authenticity against known factory samples. Neither grader opens the box, so contents authenticity relies on reseal detection — which is why pre-grading with BrickGauge before submitting catches issues the graders would flag.

↦What's the difference between authentication and grading for LEGO?

Authentication confirms the box is genuinely factory-sealed and not counterfeit. Grading assigns a numeric condition score. AFA and CGC do both in one submission — authentication is the first phase (pass/fail), grading is the second (numeric). BrickGauge's pre-grade includes both: a reseal-detection layer (authentication) and a six-axis condition score (grading).

Sealed LEGO Authentication — Buyer Protection Checklist | BrickGauge