I'll give you one better.
Toy's R Us used to deliberately give people back the lowest selling price in the last 90 days - either in cash or store credit - to people returning merchandise with a gift receipt. I understood this if someone returned merchandise without a receipt, but if they had a receipt, it should be returned for merchandise credit of the purchase amount.
So if the person receives a gift and returns it to the store because they have received a duplicate gift or whatever, and they say "hey, I can't find anything, can you use this gift receipt and give me store credit for later"?
Be aware that they will not get store credit for what you paid for that item - they will get the lowest selling price in the last 90 days. This is even though they have a receipt! Total rip off and in my mind, not okay! So I give people the actual receipt now - if they have the actual receipt, Toys R Us can not do that. This was their policy at least 1 year ago - I stopped shopping with them after I found out they were doing this. It happened to me when I sent my husband back to the store with a gift receipt because I had it handy - he caught it and I was like no way - come back! The item was worth double what they wanted to refund us in merchandise credit, and I had accidentally purchased two of the item (birthday party fiasco). We found the original receipt so it worked out, but no more TRU for us. This item had only been purchased for a few days, so it was not something that had been held for several weeks. TRU has become my least favorite store - their items are hard to understand the pricing on and their policies, such as the above - are really, really hard to decipher.