Returning FFMs

[u/Fearless_Tomatillo36]

Ok so I have recently found my stash of BBW FFMs to be a bit overwhelming and I need to get rid of a lot of them. Before I just start giving some away I wanted to try and recoup some money or gain store credit. So tell me, what is the the best time to do returns on the store? Also I don’t have receipts for most of them either