Onyx Telecaster. "exchanged" by a bandmate who wanted it, gave me an atrocious Quest Atak 2 in return. I didn't like the idea, and one day I got home from work to find it in my room, and all my dad would say was "let's not talk about it". Technically: recovered item... not lost.
Onyx Precision bass in Silverburst. Equally as well built as my beloved Telecaster. Loaned it to my keyboard player who lived a city away, kept meaning to return it and confessed some time later to it being sold.
Onyx Jazz Bass, ALSO in Silverburst. Purchased on lay -away from a local music store. Went out there to make final payment, the store was empty and they had skipped out.
Boss OD-1. Just the right amount of bite for a Jazz Chorus, Went to jam at ex bass player's house, other guitarist was trying it with his rig, I said he could use it and I would get it back next week. Next week never came, entire band deny ever seeing the pedal.
Dunlop Cry Baby Wah - modded pot to give extra treble. Loaned to Bosses son. They sold business and son had moved interstate.
Ibanez Tubescreamer Soundtank TS5. I simply didn't have this pedal anymore... just gone.
DOD Thrashmaster - Yes the Flouro Pink one. Lost this to a bass player who liked to paint things. Painted a swirling mess of thick paint that clogged it up and disabled pots. He was left with it.
Boss Volume Pedal - The singer of a metal band who was sharehousing with a guy I was jamming with wanted to experiment with this, offered me $50. I said no. Realised at next gig the pedal wasn't in gig bag. Singer denied any action.
1 x Unloaded 4x8 Fender sound column. Left at parents home when I moved out. Folks moved house, This didn't.
On Stage stands Boom mic stand... my baby, I travelled every gig with this one. Lost when the Theatre Restaurant I worked at caught fire.
... then there were about 4 mics that went with me and others came back.... brands gone, beyer, I think a sennheiser... no name specials etc