This is a little more iffy because it was not given to the property agent or placed in a designated location.
You relied on the USPS. What were you thinking?
But if that is what they TOLD you to do then they assume the risk.
If stolen, their problem.
Which was why when we were doing it there were certain places that we would go collect in person and give them a receipt.
If we got robbed leaving the building that was not the tenant's problem. It was ours.
No, we never got robbed.
There was a legend that Jesse and Frank James once stayed the night at the house of an elderly woman under assumed names. They learned the bank was gonna foreclose on her property the next day. In the morning before they left they left a note for the women along with the payment for the property in full. In the note they told the woman to demand a receipt from the banker that the mortgage was paid in full. When he left her property the James Brothers robbed him and took their money back.