Grab your item gift from MapleStory

I just got these codes on like 7 accounts, but I can't enter the goddamn cash shop to redeem it (error 38). And the codes expire within a week. Pineapple you, Nexon.

Are these accounts that haven't logged in in a long time, or something like that?

If your main is an adventurer, you can redeem these items on other adventurers on the same account, and then leave the items in cash shop storage for when your main can fetch them out.
(That's assuming they're not 2x cards that start ticking as soon as you redeem the code...)