Too lazy to re-type all the proof again. Re-suggesting from https://backpack.tf/suggestion/5ffb691b0687726701000ab0#comment-5ffd25e7f8cc15747763b7df

I bought and sold one recently.

Classified listings

8 buy listings for 26 keys

Selling for 30 keys

https://backpack.tf/classifieds?item=Bombing+Run&quality=5&tradable=1&craftable=1&particle=89&australium=-1&killstreak_tier=0

Mini for starstorm slumber Airdog (21) + 8 keys

https://backpack.tf/profiles/76561198046353418#!/compare/1609891200/1609977600

https://backpack.tf/profiles/76561198079732932#!/compare/1609718400/1609977600

Bought for 27 keys

https://backpack.tf/profiles/76561198046353418#!/compare/1609632000/1609718400

Currently untraceable on the seller's end. https://backpack.tf/item/3445831991

Most recent marketplace.tf sale, November 4th 2020 at $59.99.

At the time keys were $1.80

59.99/1.80 = 33.3 keys (round to 33)

https://marketplace.tf/items/tf2/249;5;u89

Sales at:

27

29

33

30

31

Thanks to Shuffle spy for

https://backpack.tf/profiles/76561198079732932#!/compare/1609977600/1610150400 - added 9 keys for a scorching handyman's handle. Outdated price, s/o at 41.5 keys, b/o at 36 keys.

https://backpack.tf/profiles/76561199102451836#!/compare/1607299200/1607385600 - Sold for 30 Keys

https://backpack.tf/profiles/76561199019427074#!/compare/1607385600/1607472000 - Bulk sale

https://backpack.tf/profiles/76561199019427074#!/compare/1607644800/1607731200 - 31 keys

https://backpack.tf/profiles/76561198044668296#!/compare/1607904000/1607990400 - untrace

https://backpack.tf/profiles/76561198850274253#!/compare/1608163200/1608249600 - bot qs.