Just ordered and received a "new" pair of Airpods Pro directly from Apple, delivered in a fancy little Apple bag and everything. Connected to my Mac, they show a manufacture date od January 16, 2018 and some 59 charge cycles. These are in seeming perfect condition but clearly used. The packaging was utterly pristine. Serial number on box matched that on the charger. However, I have not been able to decipher the number. Anyway, back they go, as I paid the new price.
I'd suggest connecting any new pair of Airpods to a Mac and having a look at the information about them in the Menu Bar. It's all in a dropdown when you see their icon in the Menu Bar. Hover over "Condition" in the dropdown and a side window shows manufacturing date and charge info. I am unable to figure out how you'd ever discover this info on an iPhone (I have an iPhone 8). And I came across it on the Mac almost accidentally as I was fiddling with them.
This wasn't some prank in a shipping room unless they can shrink wrap products as new in those places. No way did this not happen based on a decision by some Apple manager somewhere. They came from one or another local store, I'd imagine. I'll order new ones, but will have them shipped from a more corporate site, which would have presumably fresh inventory. And I'll check them, most def.