I bought pretty good amount of Milwaukee M12 Jacket, saws, drills and batteries from home depot, but I didnt keep the receipts, they wont take the brand new drill set in the seal box for return, they unboxed, still cant return it, any suggestions?

Ask for store store credit at least you'll have your money you'll have to spend it there

Ask to speak to the store manager if you get no help then try your credit card company they might be able to help you. Next time try to keep your receipt.

Check with the costumer service. For small appliance and tools they probably take it with a home depot credit