https://backpack.tf/classifieds?item=Mister%20Bones&quality=11&tradable=1&craftable=1&australium=-1&killstreak_tier=0

Buy Orders start at 3.13, ~3.15 keys.

Sell Orders start at 4.32, ~4.3 keys.

Bot.tf Sale:

https://ibb.co/Y0Yx5Fx

1 Sold for 4.69, ~4.7 keys.

No viable Marketplace.tf sales in the last 30 days.

SCM Sales:

https://ibb.co/BBsg9wq

1 Sold for $7.73/ 2.26 = 3.42, ~3.4 keys.

1 Sold for $8.54/ 2.27 = 3.76, ~3.75 keys.

1 Sold for $6.89/ 2.34 = 2.94, ~2.95 keys.

1 Sold for $9.12/ 2.33 = 3.91, ~3.9 keys.

1 Sold for $9.12/ 2.34 = 3.89, ~3.9 keys.

1 Sold for $7.31/ 2.33 = 3.13, ~3.15 keys.

1 Sold for $7.16/ 2.30 = 3.11, ~3.1 keys.

Excluding any other sales due to them being either lower than the buy orders, or higher than the sell orders. Going with 3.15 - 3.9 keys.