Found by Bud Arnold; Manhattan, KS
I found this story wedged beneath some spectator benches, situated by a viewing window facing the ring at K.O. Boxing. The benches are located in a enclosed loggia, which also leads to a number of different restaurants and bakeries. Children frequently pause with their parents to watch the boxers spar, and perhaps this was dropped and lost on one of these occasions.
We had strange neighbours. We would hear them vacuuming or moving furniture in the middle of the night when the rest of the world would be asleep. They never really spoke to us either, tending to avoid eye-contact and would just grunt if any of us greeted them.
Outside our front door, we had a crate containing empty milk bottles. One evening, we heard their front door open then the unmistakeable clinking sound of milk bottles in our crate and then, moments later, their front door closing again. After ten minutes or so, I went to check in the crate and found this. There is no further information or explanation. We moved out a couple of weeks later.