LEGO box corner compression grading.
AI corner-damage grading for sealed LEGO boxes.
How the AI sees it.
Corner damage on a sealed LEGO box is any deformation of the four corners on the primary face — typically caused by shelf weight, stacked storage, or shipping impact. BrickGauge measures it as compression depth in millimeters plus whitening at the corner fold.
The grader perspective.
Corners are the second-biggest grade driver after seal integrity. AFA's scale literally tracks corner depth in mm. A perfect box with one compressed corner still grades NM at best — the worst-corner rule applies because graders score the most-affected corner, not the average.
↦ Scored on the BrickGauge corners axis.
Corner compression by tier.
Each tier maps to a defect signal and the grade ceiling it forces. Pre-grade your box with BrickGauge to see which tier yours lands in.
| Tier | Signal | Grade cap |
|---|---|---|
| MINT | Sub-1mm, no whitening | AFA 90+ |
| NM | 1–2mm, light whitening at fold | AFA 85 |
| EX | 2–4mm, visible whitening | AFA 80 |
| VG | ≥4mm, deep crease at fold | AFA 75 or below |
Don’t create the damage.
- 01Store boxes vertically — corner pressure goes to the spine, not the face.
- 02Never stack heavy boxes. Even a 2kg load over 6 months will visibly compress the top corners.
- 03Ship boxes inside a larger outer carton with 2-3 inches of padding around all corners.
- 04If you must shelve flat, rotate the orientation every 6 months so no single corner bears constant load.
Browse the rest.
See your corner damage scored.
Upload six photos and BrickGauge measures the corner compression on your specific box, scores it on the corners axis, and rolls it into an overall verdict. Two free inspections on signup — credits never expire.