Key takeaways
- Source sector predicts inbound grade better than anything else: 58% at 2A or better from food sites, 22% from waste handlers.
- Storage explains more than usage — material sold within sixty days grades a full rung higher than the same material after six months.
- Five-wall averages 4.2 further trips against 2.8 for four-wall, a gap larger than the price difference.
- Bottom-edge damage accounts for 61% of all rejections; everything else combined is the other 39%.
Because every box gets opened and graded individually, we accumulate an unusual data set: roughly four hundred and eighty thousand individual grading decisions a year, each tagged with source sector, footprint, wall construction and reject reason.
We finally sat down with a year of it. Four things came out.
1 · Source sector predicts grade better than anything else
| Sector | Share arriving 2A or better | Share rejected | Main reject reason |
|---|---|---|---|
| Food and beverage | 58% | 4% | Odour or residue |
| Plastics processing | 51% | 6% | Cut discharge ports |
| E-commerce and 3PL | 44% | 9% | Bottom-edge crush |
| Automotive | 41% | 7% | Rack damage to corners |
| General manufacturing | 37% | 11% | Outdoor storage |
| Recyclers and waste | 22% | 19% | Moisture, contamination |
The spread is wider than anybody expected. Food and pharmaceutical sites have dry, roofed, well-organised storage because their own product demands it, and their boxes benefit. Waste-handling operations are at the other end for the same structural reason.
2 · Storage explains more than usage
Cross-referencing reject reasons against how long a customer held material before selling it produced the clearest single relationship in the data. Material sold within sixty days of accumulation graded, on average, a full rung higher than the same material from the same sector sold after six months.
Not because the boxes were used more. Because they sat somewhere.
3 · Five-wall justifies its premium, four-wall is over-bought
Five-wall boxes arrived at higher average grades and, once placed, achieved more subsequent trips — about 4.2 against 2.8 for four-wall. That gap is larger than the price difference, which means five-wall is generally the better buy on cost per trip.
But roughly a third of the four-wall boxes we handled were carrying loads under nine hundred pounds, where four-wall is comfortably adequate and five-wall would have been over-specified. Both errors exist simultaneously in this market, in different buildings.
4 · The bottom edge is 61% of everything
Across the whole year, sixty-one per cent of rejections traced to bottom-edge damage, either crush or moisture. Every other cause combined — delamination, punctures, odour, contamination, out of square — accounted for the remaining thirty-nine.
We knew it was the leading cause. We did not know it was the majority.
What we changed
- We now ask about storage conditions before quoting to buy, and we quote differently based on the answer. It has made quotes more accurate and occasionally more generous.
- We send a one-page storage note to anyone selling to us for the first time. It costs nothing, it raises the grade of what we subsequently receive, and it means the seller gets paid more.
What we still cannot see
What happens between us. We know the condition a box leaves in and the condition it returns in, but the middle — how it was handled, filled, stacked and stored at the customer — is invisible to us. That is where the paint-pen experiment comes in, and it is the data nobody in this trade has at scale.
Questions