This is more common than one would think. In the garbage business it happens all winter long. Every other commercial front load bin has someone sleeping in it. Especially the cleaner cardboard recycle bins because they try to use cardboard to insulate themselves from the cold. We used to always pick them up a bit, shake them, and wait for a few to see if hands pop up out of the bin. And in the summer every other bin you lifted has someone sleeping behind it so that they are out of sight.
That’s odd; here in NJ they just sleep inside the clothing donation boxes (cleaner, warmer).