Zoom 9030 - Dropped off a rail bridge
Korg EA-1 - Gave it to nephew to kickstart his music career. He now works in IT.
SSL Duende - HW left on top shelf in a storage cupboard when I left my old house because it went native.
DBX Quantum - turned on after not using it for 20 years, it didn't work, so I threw it in the dumpster