Resuggesting, thanks Xergoyf and Foamy.

Sales

Sale 1: Sold for 50 keys

https://backpack.tf/profiles/76561198061489334#!/compare/1601164800/1601251200

Buyout was close enough.

https://bot.tf/stats/listings/Y96ZK78N

Sale 2: Untrace

https://backpack.tf/profiles/76561198126243487#!/compare/1591142400/1594080000

https://backpack.tf/profiles/76561198125791160#!/compare/1593993600/1594080000

Sale 3: Sold with 10 keys for Massed Flies Pyromancer's Mask

https://backpack.tf/profiles/76561198222580424#!/compare/1597622400/1601251200

https://backpack.tf/profiles/76561198061489334#!/compare/1598227200/1598313600

Using there.

Sale 4: Sold for 43 keys

https://backpack.tf/profiles/76561198317802744#!/compare/1593734400/1596153600

https://backpack.tf/profiles/76561198046841396#!/compare/1592784000/1593907200

https://bot.tf/stats/listings/YD1KNQ9K

Confirmed by seller: https://gyazo.com/45794a4faa7e8d7d6a26282a0cfac390

Sale 5: Untrace

https://backpack.tf/profiles/76561198182738317#!/compare/1600300800/1600992000

https://backpack.tf/profiles/76561198993873071#!/compare/1600473600/1600732800

Sale 6: Sold for Scorching Flames Ol' Snaggletooth + 10 keys

https://backpack.tf/profiles/76561198282873040#!/compare/1598054400/1598140800

https://backpack.tf/profiles/76561198182738317#!/compare/1598054400/1598140800

Using there.

Sale 7: Sold for 42 keys

https://backpack.tf/profiles/76561198841365001#!/compare/1598054400/1598140800

https://backpack.tf/profiles/76561198282873040#!/compare/1597968000/1598054400

Sale 8: Bulk for 79 keys

https://backpack.tf/profiles/76561198195933333#!/compare/1597968000/1598054400

https://backpack.tf/profiles/76561198841365001#!/compare/1597968000/1598140800

Sale 9: Sold to a buyorder of 40 keys~

https://backpack.tf/profiles/76561198027247217#!/compare/1597622400/1597968000

https://backpack.tf/profiles/76561198195933333#!/compare/1597536000/1597622400

https://bot.tf/stats/listings/Y798WN19

Marketplace sales

https://marketplace.tf/items/tf2/95;5;u109

Nothing recent.

Current Classifieds

https://backpack.tf/classifieds?item=Burning%20Question&quality=5&tradable=1&craftable=1&australium=-1&particle=9&killstreak_tier=0

https://gyazo.com/337e8e2c8e79cb9bf2b61a86ab830786

Summary

Sales at 40, 42, 43, and 50.

Conclusion

40 and 42 are under buyers, excluding them.

Going with 43-50 here.

Take it easy.