Who the hell carries around purchase receipts in a backpack?
___________
Jeez, how about a person who bought the weapon while carrying his backpack? I know more than a few people for whom their backpacks are every day accessories.
Some might be a tad quick to see coverup on this point.
Well yeah, obviously, but doesn't it seem a bit odd that a person who went on a murderous rampage would have the receipt for the gun which he used to kill thirty three people on him? Do you expect that backpack to contain the receipts of every purchase he made in the last sixty days or so?
"Better keep this receipt in case I want to return this baby after I kill a few people . . . "
You mean...some FReepers are conspiracy minded?
Nah.