Item 1: https://backpack.tf/item/16085380046

Sale 1:

https://backpack.tf/profiles/76561199199755458#!/compare/1765929600/1771718400

https://backpack.tf/profiles/76561199105379276#!/compare/1763769600/1766188800

Bulk

Item 2: https://backpack.tf/item/16026380483

Listed on Mannco.Store

Item 3: https://backpack.tf/item/13931280566

Sale 2:

https://backpack.tf/profiles/76561198354834516#!/compare/1772323200/1772496000

https://backpack.tf/profiles/76561199026390261#!/compare/1772236800/1772323200

Dumped to STN for ~18 keys

Sale 3:

https://backpack.tf/profiles/76561199026390261#!/compare/1772409600/1772496000

https://backpack.tf/profiles/76561198335776406#!/compare/1772323200/1772496000

Sold for ~21 keys

Sales:

21

Sellers:

BPTF - https://imgur.com/xQuA2YU 28 keys (4 months), 30 keys (6 months)

MPTF - https://marketplace.tf/items/tf2/30918;5;u3200 none

STN - https://stntrading.eu/item/tf2/Unusual+Lost+Signal+Taunt%3A+Surgeon%27s+Squeezebox none

SCM - https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20Surgeon%27s%20Squeezebox?filter=Lost+Signal https://imgur.com/MGkcAvf none

Going with 21 keys since 18 was a quicksell

Item 3 sold again

Sale 4:

https://backpack.tf/profiles/76561198335776406#!/compare/1773273600/1773360000

https://backpack.tf/profiles/76561198059509731#!/compare/1773273600/1773360000

Sold alongside the Lost Signal Hot Wheeler and Lost Signal Jumping Jack for 47 keys (bulk)