According to Mr. Mack did not make any profits by getting the discount from the wireless provider, it is easy to prove it, just show everybody what did he do with that money, paid to wireless company? If he did, where is the copy of the check? And who did he pay?
And maybe Mr. Mack was a nice guy, just wondering why can he pay the person back with a check after he sold his or her phone, The way everything is clear, right?