This sold for several Unusuals, but the Honcho's in this sale was traded back a little bit after, so it'd be best to not use this sale. Other items have no sales.

https://backpack.tf/profiles/76561198322957656#!/compare/1726531200/1726617600

This added a Slumber Toadstool + FN Isotope Cardboard Paint + 2x Spelled Crone's for a 2x Spelled Spellbound Tin-Gallon

https://backpack.tf/profiles/76561198310972287#!/compare/1727049600/1727136000

Toadstool Sales:

https://backpack.tf/profiles/76561198306870587#!/compare/1725062400/1725148800 - Quicksold for 155 Keys + 2.77 Refined

https://backpack.tf/profiles/76561198360428856#!/compare/1722729600/1722902400 - 255 Keys for this and a Vivid Toadstool

https://backpack.tf/profiles/76561198311498888#!/compare/1725753600/1725840000 - Quicksold for 152 Keys

https://backpack.tf/profiles/76561198322957656#!/compare/1722729600/1722816000 - Bulk sale

This makes the Toadstool 153.5 Keys.

Paint Sales:

https://marketplace.tf/items/tf2/17211;15;u702;w1;pk211 - $179.99 (106 Keys) and $188.89 (100 Keys)

This makes the Paint 103 Keys.

Crone's Sale:

https://backpack.tf/profiles/76561198310972287#!/compare/1727136000/1727481600 - 45 Keys

Tin-Gallon Sales:

https://backpack.tf/profiles/76561198252464336#!/compare/1720828800/1721001600 - 950 Keys + Spelled Burning Dragonborn

https://backpack.tf/profiles/76561198252464336#!/compare/1723852800/1723939200 - The Dragonborn sold for 500 Keys

https://backpack.tf/profiles/76561198258937500#!/compare/1720915200/1721174400 - FN Pro KS EOrb KotJ Mini + Time Warp Samur-Eye (no sales)

https://backpack.tf/profiles/76561198258937500#!/compare/1721520000/1721692800 - 1445 in Unusuals + the Desert Marauder (no sales)

https://backpack.tf/profiles/76561198285371555#!/compare/1724284800/1724371200 - Used for the Whoopee

This makes the Tin-Gallon 1450 Keys.

1450 - 153.5 - 103 - 45 = 1148.5 which rounds to 1150 Keys.

The Arcana Sultan's was updated to 1025 Keys, so sale 3 in this suggestion should be 1325 Keys which can round to 1350 Keys.

1150 - 1350 would work as a range.