Selling YZY x GAP

I’m looking into selling some stuff on StockX and GOAT but some of the items “can’t be found” I use the scanner on StockX. Also, does StockX not sell everything from the collection? Just trying to pair stuff and find an accurate stock photo of the items to post with the listing as far as eBay goes. Which the scanner on there doesn’t bring back results for some things too. Sorry for this mornings headache.