I went through this nightmare yesterday! Their gift receipts give no information so I had to do several returns with my license. I wish I registered at Buy Buy Baby.
this doesn't make sense, did you give them the gift receipts? If you didn't when they scan the receipt it pulls up the transaction information and they can do a return, for store credit. This seems to be the norm for most gift receipts. I'm not sure why you needed to use you liscence