Thanks for all the input Shuffle!

Secret to Everybody Modest Pile of Hat

Sales only on: https://backpack.tf/item/2075733431

Sale 1:

https://backpack.tf/profiles/76561198068732040#!/compare/1560038400/1560124800

https://backpack.tf/profiles/76561198129995083#!/compare/1559952000/1560124800

Sold for an ooze counterfeit billycock, eerie orbiting fire le party phantom, flaming lantern le party phantom , Strange Horseless Headless Horsemann's Head, molten mallard scotsmans tovepipe, time warp detective noir and a subatomic univeral translator, showstopper flippin' awesome,midnight whirlwind mannrobics and midnight whirlwind surgeon's squeezeboz

Can't use this sale as buyout isn't definitive, should cap somewhere around 400 keys.

Not including.

Sale 2:

https://backpack.tf/profiles/76561198129995083#!/compare/1561680000/1561766400

https://backpack.tf/profiles/76561198134512931#!/compare/1561680000/1561766400

bulk for Misty Skull Crone's Dome

Sale 3:

https://backpack.tf/profiles/76561198134512931#!/compare/1564531200/1564617600

https://backpack.tf/profiles/76561198109141608#!/compare/1564358400/1564617600

Sold for a strange killstreak kritzkrieg, sunbeams gaze, scorching flames das hazmattenhatten, #42 nose candy and a burning flames gentleman's gatsby

Mini for sunbeams gauzed gaze:

Sold on marketplace.tf for 220$ on 10/9

keys were 1.79

Sale: 220/1.79=123

Taking as 123 keys

Mini for Scorching dazmattenhatten:[b]

[b]Mini for killer's exclusive:

Sold for 700$ on marketplace on 6th June 2019

keys were 1.84$ that day

$700 / $1.84 = 380.43 keys

Rounding to 380

Sale: 380 keys

Sale 5:

https://backpack.tf/profiles/76561198089253101#!/compare/1564963200/1565049600

https://backpack.tf/profiles/76561198040316565#!/compare/1564963200/1565395200

Sold for a darkblaze Well Rounded Rifleman(372), max's severed head(21.3) gun mettle key (1.1) and around a key in sweets (48 ref)

Sale: 372+21.3+1.1+1=344.4

Capped by buyout of 368 keys: https://imgur.com/a/85BvhQE

Sales: 368,380, 400

low end is supported by sale 4 and high end is supported by sale 1

Taking 368-400