Many stores will not stock returned items back on the shelves and instead sell them to companies like Liquidators Marketplace which is like the eBay of buying tools by the pallet. They turn around an auction them off to people who then take the time to sell them by the piece to maximize profits as a side hustle.
All I can say with these types of purchases, is good luck trying to return it for any reason.
From their terms of service:
OfferUp is not a party to such transactions, and does not facilitate such transactions, refunds or returns in any manner.... OfferUp further disclaims any and all responsibility to facilitate or provide refunds or returns in any manner, other than as expressly provided in the .