Call the store
Not without the receipt and yes if you purchased it with a credit or debit card it would show up on your statement which is also proof of purchase.
Maybe if you bought it with a credit or debit card. The card should be in the system. Always best to have receipts though.
If you bought it with a credit/debit card you would be able to return. If you bought it online, and if it has a seller other than Walmart, contact the seller first. If you are still under warranty the seller should instruct you if you could drop at Walmart or send you a return label for UPS or FedEx, which ever the seller prefers and you could pack it and drop it.
If it's their product they usually give a gift card without a receipt or credit your card back.
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