Suggestion version 2.0 w/ fixed price ranges + updated buy and sell orders + added more sales information.

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

Buy Orders start at 2.04, ~2.05 keys.

Sell Orders start at 3.15 keys.

Bot.tf Sales:

https://ibb.co/zRJPqjL

5 Sold for 3.54, ~3.55 keys.

1 Sold for 3.55, ~3.55 keys.

1 Sold for 3.27, ~3.25 keys.

1 Sold for 2 keys.

Marketplace.tf Sale:

https://ibb.co/MhnP7Md

1 Sold for $5.30/ 1.83 = 2.89, ~2.9 keys.

SCM Sales:

https://ibb.co/z7Z39YG

1 Sold for $5.01/ 2.32 = 2.15 keys.

1 Sold for $6.04/ 2.30 = 2.62, ~2.6 keys.

1 Sold for $6.85/ 2.30 = 2.97, ~2.95 keys.

2 Sold for $5.83/ 2.25 = 2.59, ~2.6 keys.

Excluding all other sales due to being either too low for current buy orders, or too high for current sell orders. Going with 2.15 - 2.95 keys.