Returning baby clothes/items with no gift receipts? How..

J.
Hi ladies, had my baby shower this past weekend and loved everything we received, but received way too many newborn sized clothes (and our baby is already measuring big) and also some duplicates on bigger items, love the stuff but want to return for bigger sizes and other items we need instead of duplicates... Problem is barely anyone gave us a gift receipt and we can't tell from the tags where they came from 😔 do you have a way of telling, or going about this that you know of? Someone told me if Walmart carries the item in general they will take it even if we didn't buy it from there but not sure about that... Also searching for a scanner app that may help but no luck yet  help please lol