Thanks shufflespy!

New Sale!

Sale 1: 350 pure

https://backpack.tf/item/16158340558

https://backpack.tf/profiles/76561198056544160#!/compare/1782777600/1782950400

https://backpack.tf/profiles/76561198085556501#!/compare/1782864000/1782950400

https://imgur.com/a/W3t8Kwh

Sale 2: 400 (credit shufflespy)

Another one sold for a Death's Daggers Nuke (190 Keys) + Demonic Impaler Tundra Top (139 Keys) + Treasure Trove Brothers in Blues (71 Keys)

https://backpack.tf/profiles/76561198328282971#!/compare/1785888000/1785974400

190 + 139 + 71 = 400 Keys

The Tundra Top has one prior sale for 132 Keys + Amethyst Winds Fist Bump (~7 Keys)

https://backpack.tf/profiles/76561198056354036#!/compare/1776729600/1785283200

132 + 7 = 139 Keys for the Tundra Top

The Fist Bump has one traceable, usable sale for 7 Keys + 12.33 Refined

https://backpack.tf/profiles/76561198070301190#!/compare/1783123200/1783209600

The Brothers in Blues has these sales

https://backpack.tf/profiles/76561197999362239#!/compare/1785542400/1785628800 - 68 Keys

https://backpack.tf/profiles/76561198061440669#!/compare/1777852800/1777939200 - 75 Keys

https://backpack.tf/profiles/76561198882175555#!/compare/1777334400/1777420800 - 69 Keys

https://backpack.tf/profiles/76561198088878793#!/compare/1782691200/1782864000 - 72 Keys

https://backpack.tf/profiles/76561199564942025#!/compare/1781913600/1782000000 - 67 Keys

There are other sales I didn't look into, but the range for the Brothers in Blues won't change enough to matter here if those sales are looked into. 67 - 75 averages to 71 Keys for the Brothers in Blues.

A range of 350 - 400 would work here.