Assuming you have a valid (or fake, but I don't recommend that) ID, it can be returned to Walmart without a receipt.
TRU requires a receipt for returns.
I'm not sure about Target, Zeller's, or any other stores like that as I don't usually frequent them due to distance.
Most stores in malls probably require receipts as well.
Good luck with your effort to replace it.
EDIT: Anyone notice we all just assumed it was Movie Landmine? If it's
Cyb or Energon Landmine, he's pretty much out of luck...