I feel like my returning it would be contingent on where I'd found it and other miscellaneous details. For instance, if I saw that the wallet had Filipino money in it more primarily than American money, I might see returning it as more complicated from assuming a cultural or language barrier (which is funny, as my wallet has some foreign money in it too). Realistically speaking, I could see myself just not picking up the wallet in the first place to find out, a figure we can't account for in this man's... "Science".
It'd be a curious thing to see who'd steal the money if the wallets had cash worth more than around $10, not to mention credit cards or a social security card. He made the wallet barely worth stealing from, and I could see some just throw the wallet away.
The guy's too focused on the sentimentality of the wallet itself, plus a sample size of 10 people in 20 states isn't the greatest cultural sample, considering the US itself. The "Secret Footage" ideas are pretty nice though.
Ę̵̚x̸͎̾i̴͚̽s̵̻͐t̷͐ͅe̷̯͠n̴̤̚t̵̻̅i̵͉̿a̴̮͊l̵͍̂ ̴̹̕D̵̤̀e̸͓͂t̵̢͂e̴͕̓c̸̗̄t̴̗̿ï̶̪v̷̲̍é̵͔