Maybe you are talking about
this incident that involved a Ledger Nano S that was purchased from Amazon in the UK. The person who bought it, got a paper card already filled up with a 24-word seed. Not sure if the seed was also entered in the hardware wallet, but I am guessing it was.
Yes, that's the one, thanks for finding it. The things are:
* I don't know exactly how such a locker works and whether OP cannot pick up the item, tamper it and then "post it" to another locker for the user (in my country the lockers belong to the shipping company and multiple sellers can use it). On the worse case OP can have a shop at Amazon and maybe he can get to use the locker. Of curse, it's a big hassle with small chances to catch somebody and steal his money.
* If the same problems like in that (Amazon UK) topic will happen, OP trust (which he may gain meanwhile) may vanish, even if it's not his doing
I see it a risky endeavor for both sides (yeah, trust is a bitch), but if OP gets customers for it, ... very nice and good luck.