For now you could just put the crappy ones up for auction at unreasonable prices and not take them out of your Tubmail when they return, the auction listing fees are absolute peanuts on .moars.

With the 300 item limit, which is too low for comfortable .moar file collecting anyway, you’re going to have to do something like that at some point anyway.

That’s just a tip for a quick and ugly fix on your end, though, and I think collapsable inventories, a raised item limit and costumes should all be implemented sooner rather than later.