the ethereum endpoint (getnfttransfers) seems to be calling for previous sales (same result as getnfttrades) and not transfers. do you have an endpoint that will deal with transfers?
getnfttransfers and getnfttrades responses data should be different. All the items from getnfttrades will exist in getnfttransfers but not all the items in getnfttransfers will exist in getnfttrades.