So I bought a LEGO set last week and I need to return it because there were a few pieces missing but I do not have the receipt would I still be able to return it?

Yes...they most likely will give you a store credit

Andrew yoy should be able to. They'll give you a gift card back instead of cash.

They dont require a receipt. You should be able to get cash also, if not they will give store credit.

Yes you will receive a merchandise credit.

Yes but... 1) You must have an ID 2) They can only give you store credit with no receipt. You won't receive cash.