Assuming you didn't mark the package "do not open, cash inside" I doubt you'll have any issue with the USPS. A thief is going to go for the easy pickens, and it's not like they're randomly opening boxes.
I would have probably called the guy and told him to drive down and get it to avoid any risk. Most normal people would be very thankful, as especially considering your occupation I can't fathom how they could accuse you of theft.
-spence
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