I got this wifi extender but cant find receipt. It wont work with my wifi so will they let me exchange it for things at the store?

Yes but usually exchange for same thing in my experience without reciept

Yes

Are you completely stupid? Is this your first time buying stuff at Wal-Mart? You can take it back but without a receipt you won't get cash they will probably give you a Wal-Mart gift card.

No you will not get your money back yes your able to do an exchange with getting the same item unless there out of that item then you can get another one different than the one returned but the item does the same thing unless there are none then they will let you get whatever you want of the same value