Can you return an item as large as a $250 purchase without a receipt for instance I bought a giant tent I lost my receipt and it's $250 but it's still brand new would I be able to return it to this Walmart without a receipt and get a gift card

Store credit or return on credit card / atm

Probably store credit only if purchased there

They can tell by the sku number when it was sold, and they will also ask you how you paid, to track the purchase, if they believe it's not their product, you won't get a credit, if it is within 30 days and it is their product they will give you a credit, to the best of my knowledge.

I think you can but they would give you a store credit not money back but I'm not 100% sure