Item 1: https://backpack.tf/item/5654735321

Sale 1:

https://backpack.tf/profiles/76561198135483308#!/compare/1772236800/1772323200

https://backpack.tf/profiles/76561198311498888#!/compare/1772236800/1772323200

Dumped to STN for 11 keys

Sale 2:

https://backpack.tf/profiles/76561198311498888#!/compare/1772323200/1772409600

https://backpack.tf/profiles/76561199821644893#!/compare/1772409600/1772496000

13 keys

Item 2: https://backpack.tf/item/11598442636

Listed on MPTF

Item 3: https://backpack.tf/item/4666567482

Sale 3:

https://backpack.tf/profiles/76561198093031738#!/compare/1769385600/1769472000

https://backpack.tf/profiles/76561198140797825#!/compare/1768867200/1770163200

Untrace

Item 4: https://backpack.tf/item/16111072202

Sale 4:

https://backpack.tf/profiles/76561199021812495#!/compare/1771718400/1772064000

https://backpack.tf/profiles/76561199207750538#!/compare/1771804800/1771891200

Bulk

Sale 5:

https://backpack.tf/profiles/76561199207750538#!/compare/1771977600/1772150400

https://backpack.tf/profiles/76561198062747535#!/compare/1772064000/1772150400

Dumped to a bot, untrace

Item 5: https://backpack.tf/item/15298374426

Sale 6:

https://backpack.tf/profiles/76561198062305430#!/compare/1773014400/1773532800

https://backpack.tf/profiles/76561199192607141#!/compare/1773446400/1773532800

Dumped to a bot for most likely 11 keys https://gladiator.tf/sales?item=Lost%20Signal%20Taunt:%20Skullcracker&at=2026-03-29T17:06:07.750Z

MPTF: https://marketplace.tf/items/tf2/1111;5;u3200

Sale 7:

Sold for $39.99 on March 9 2026

Keys were $1.89 https://marketplace.tf/items/tf2/5021;6

39.99/1.89=21.16 ~21 keys

Sales:

11 (1 confirmed, 1 potential), 13, 21

Sellers:

BPTF - https://imgur.com/A5MkfI9 2 at 19 keys (5 months and 11 days), 20 keys (1 day)

MPTF - https://marketplace.tf/items/tf2/1111;5;u3200 $39.99 (~20 keys)

STN - https://stntrading.eu/item/tf2/Unusual+Lost+Signal+Taunt%3A+Skullcracker none

SCM - https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20Skullcracker?filter=Lost+Signal https://imgur.com/1Df9beP none

21 is definitely an outlier given that sellers for pure which are lower aren't able to sell. If there wasn't that 22 sale that is being excluded I would have included 11 since it's been proven to be a fairly common trading point, but in that case excluding it balances out the range.

Going with 13 keys flat