Once I accepted the package and Opened it, I saw that it was from CVS. The order I had placed was not delivered, however, I was charged for missing items.

if you actually read the post he went to UPS not USPS

Depends on the country. Also, dude went to a UPS store, which is not the Post Office.

It wasn’t the post office if had bothered to read. It was UPS. The package was not marked on the outside. However after opening it, I saw that I had placed an order with CVS. There was nothing in the package. I was charged for nothing.

in services like UPS, DHL, FedEx etc it is possible to send packages and have the receiver pay for them instead of the sender

The amusing thing is that most freight companies will default back to the sender for payment if the package is not delivered/collected. So if you aren't expecting a receiver pays package and there's no identifying information on the consignment as to who sent it with a customer reference.. just don't accept delivery. They can't force you to accept it.