Mission accomplished!
But there was a snag. When I went to my secret dumpster paradise, I saw that they had removed them! Plus, there was a TRUCK DRIVER, somebody with the authority to be there!
So I went to my customary supermarket, and saw a nice, big, side-opening dumpster. It was abandoned except for three parked cars. I made the drop.
As I was leaving, though, I noticed a woman in one of the cars talking on her cellphone. I assume she was just taking a break from work and gabbing with a friend. At least that's what I hope: the dumpster had a sign, "No Public Dumping. $500 Fine."
I figure if I don't hear anything about it for a whole week, then I'm home free!