Yesterday, I sold 20 spawners to someone, and the person only picked up 1 spawner. 19 spawners vanished. It was not clearing entities, because then all 20 would be missing. LexKristen was able to confirm that I dropped 20 spawners and the person only had 1. The issue was resolved, so I don't care about getting my spawners back. I, however, want to let everyone know that this has happened, and can possible happen again. I doubt it will be fixed, though.