What is a pack map?
In short: A known pattern in how some products are packed. Where one applies, it can show whether packs in a sealed box have been moved or swapped, so I use it as one of the reseal checks.
Not every product has a useful pack map, which is why the check is applied "where it applies". When it does, the order or arrangement of packs is one more thing a factory box should match and a tampered box often will not.
A pack map is never enough on its own. It sits alongside weight against reference and the seal and shrink pattern. See how I check if a box was resealed.
Here is how it fits into a reseal check. Before a box is opened, or before you buy it, I weigh it against reference and photograph the seal and the shrink wrap. Where the product has a known pack arrangement, I compare what I can see against it. Each check is photographed and named on the sheet, and the finding is one of three: consistent with factory-sealed, not consistent, or inconclusive.
Reseal verification is a flat fee per box, quoted in writing. It is most useful before money changes hands, and it can be done in person or from the seller's photographs, with the limit of a photo-only review stated on the sheet. See what is reseal verification?