the s/n will wear out over time. the packaging also show more details for better recognition. They are not only dealing with 1 claim, they are dealing with hundreds or maybe thousands per day. Then, need to deal with those unreasonable consumers.
the sticker is to verify, item is sold under that specify distributor.
it can also be a requirement by the manufacturer, to be return together with the packaging.
If come the extent they need to deal with thousands of cases a day, the product istotally unreliable already.