Item 1:https://backpack.tf/item/15367977519

Listed on Mannco.Store

Item 2: https://backpack.tf/item/5187779411

Listed on MPTF

MPTF: https://marketplace.tf/items/tf2/1168;5;u3200

Items 3 and 4: https://backpack.tf/item/15969564811 https://backpack.tf/item/5578007789

Sale 1:

Sold for $16.55 on January 28 2026

Keys were $1.85 https://marketplace.tf/items/tf2/5021;6

16.55/1.85=8.95 ~9 keys

Sale 2:

Sold for $20 on March 20 2026

Keys were $1.93

20/1.93=10.36 ~10.5 keys

Sales:

9, 10.5

Sellers:

BPTF - https://imgur.com/ex81lv3 none

MPTF - https://marketplace.tf/items/tf2/1168;5;u3200 $20 (~10 keys)

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

SCM - https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20The%20Carlton?filter=Lost+Signal https://imgur.com/0GqkkwG none

Median between the sales is (8.95+10.36)/2=9.66 so rounding to the nearest 0.5 keys and taking 9-10.5 keys