I had an insured parcel that was "said" to have not been received by the out of state company I sent it to. Yeh, I did the USPS paperwork and all that goes with it and guess who lost $100.
I had another deal where I claimed fraud through the mail-guess how that one ended. Guy was selling ebay stuff that was non-existent. I had an actual confirmed street address too! USPS is like a pure waste of time!!! It was an in-state deal & I did persist(through Louisville, KY police) and after a year or so (and a much longer story) I got my money!
Good luck if you try to deal with the USPS agency, as you'll need it.
I've sold many vehicles to strangers and there is NO way to be totally safe-maybe cash-IF it's real.
I wrote a personal check for a UTV this week-no problem and that's typical, same deal when I bought a new PU truck in March. Dealers know how to find you. i always ask for a contact person at the bank/CU that issued the cashiers check and I do call them before I release the vehicle.
Paypal is a money suction device but it does make things safer in sales to strangers and I use it often for that reason alone. Widely used for some very good reasons.
There is almost nothing convenient about the USPS either. People that work for a living, try and stand there in line in most cities!