For a while Prof. x was getting a certain dietary supplement from one of those mail-order companies. He eventually decided to stop using it and canceled the standing order. The company was pretty good about it, but earlier this month sent another bottle of the supplement (Prof. x never opened the package: I called the company to ask about it and they said it was sent as a free trial because they'd reformulated the supplement). I put "RETURN TO SENDER" in red letters on the label, took the box over to the post office and handed it to a clerk. Yesterday, Prof. x got it back. This time I crossed out Prof. x's name as best I could with a Magic Marker, added "REFUSED 2x" for good measure, and intend to explicitly tell the PO guy that it's refused. Will this work? Am I doing the right thing?