A few recent sales:

Sale 1 - https://backpack.tf/profiles/76561198122604075#!/compare/1603324800/1603584000 (700 keys pure and Circling Heart Old Guadalajara) = 720.5 keys

Sale 2 - https://backpack.tf/profiles/76561198094190043#!/compare/1603584000/1603670400 (Sold for 900 keys pure)

Sale 3 - https://backpack.tf/profiles/76561198134533516#!/compare/1603929600/1604016000 (Sold with a Chiroptera Venenata Chieftain's Challenge + 150 keys for Hellfire Mohawk + Arcana Rotation) (Excluding no usable mini on the Hellfire Mohawk) But if taken current prices:

Added 199 + 150 for 815 + 805 = 1271 keys.

Sale 4 - https://backpack.tf/profiles/76561198134533516#!/compare/1604275200/1604361600 (Sold for Gravelly Ghoul Patriot Peak + Cloudy Moon Patriot Peak + Blizzardy Storm Soldier's Slope Scopers // = Excluding Ghoul Peak can't be priced now unstable sales.

For example - https://backpack.tf/profiles/76561198106280342#!/compare/1602547200/1602720000

https://backpack.tf/profiles/76561198218095591#!/compare/1602115200/1602288000

https://backpack.tf/profiles/76561198112331037#!/compare/1602806400/1602979200

I'm a bit confused about the sales.

Another sale - https://backpack.tf/profiles/76561198097171432#!/compare/1604448000/1604534400 sold for 400 keys pure + It's A Secret To Everybody Defiant Spartan (190) + Time Warp Virus Doctor (96) + Morning Glory Human Cannonball (90) + Frostbite Timeless Topper (55) + Anti-Freeze One-Man Army (85) + Demonflame Bubble Pipe (152) = 1068 keys, B/O was 2,000.

Excluding this sale and taking Sale 3 as an outlier.

Minis - https://backpack.tf/profiles/76561198869144080#!/compare/1604016000/1604188800 (Added 485 keys with Hellfire Mohawk for Death at Dusk Antlers, taking outdated bp price, no usable mini)

https://backpack.tf/profiles/76561198057747574#!/compare/1603584000/1604448000 (Sold for 199 keys pure) Chiroptera Venenata Chieftain's Challenge

Credits to Polar and Foamy for their comments on my previous suggestion to suggest this new range.