i want to validate my my purchase date for my apple airpods gen 3

It is very possible that these AirPods were at this dealer at the earlier date. If they are not an Apple Authorized Reseller (AAR), you only have the option to return them and you should ask for a full refund. Then be sure to buy them either directly from Apple or an AAR.

Alternatively, you can follow the directions in the support article you came here from to update the purchase date.