Item 1: https://backpack.tf/item/3665009973

Sale 1:

https://backpack.tf/profiles/76561198032424544#!/compare/1780876800/1781568000

https://backpack.tf/profiles/76561198763467823#!/compare/1781481600/1782086400

Untrace

Item 2: https://backpack.tf/item/9534514238

Sale 2:

Mannco.Store, untrace

Item 3: https://backpack.tf/item/13407124868

Sale 3:

https://backpack.tf/profiles/76561198257750481#!/compare/1777939200/1778716800

https://backpack.tf/profiles/76561199887329076#!/compare/1777939200/1780531200

Untrace/bulk, then listed on Mannco.Store

Item 4: https://backpack.tf/item/5182614958

Sale 4:

https://backpack.tf/profiles/76561198850121720#!/compare/1780012800/1780099200

https://backpack.tf/profiles/76561199842601782#!/compare/1780099200/1780099200

Only the Strange Toss-Proof Towel with Aussie Gold paint matches, nothing usable in buyer's compare

Sale 5:

https://backpack.tf/profiles/76561199842601782#!/compare/1780099200/1780099200

https://backpack.tf/profiles/76561199697394581#!/compare/1780012800/1780099200

Dumped back to Quicksell.Store, untrace

Sale 6:

https://backpack.tf/profiles/76561199697394581#!/compare/1780963200/1781049600

https://backpack.tf/profiles/76561198132966798#!/compare/1780531200/1781049600

4 keys 30 ref (4.52 ~4.5 keys)

Sales:

4.5

Sellers:

BPTF - https://imgur.com/Ra4ntJ1 5 keys (1 month)

MPTF - https://marketplace.tf/items/tf2/1111;5;u3120 $9.99 (~5.3 keys)

STN - https://stntrading.eu/item/tf2/Unusual+Floppin%27+Frenzy+Taunt%3A+Skullcracker none

SCM - https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20Skullcracker?appid=440&q=Floppin%27+Frenzy https://imgur.com/IhvxErJ none

Going with 4.5 keys