Item 1:

https://backpack.tf/item/1297770199

Duped

Item 2:

https://backpack.tf/item/1173456495

Sale 1:

https://backpack.tf/profiles/76561198072441047#!/compare/1767225600/1767312000 - Doesn't show

https://backpack.tf/profiles/76561197982127154#!/compare/1767225600/1767312000

Sold for a Otherworldly Weather Shellmet. No other sales for the shellmet, using there

Sale 2:

https://backpack.tf/profiles/76561198267930919#!/compare/1766534400/1766620800

https://backpack.tf/profiles/76561198072441047#!/compare/1766534400/1766620800

Sold for 400 keys pure (ID 16548293361)

Item 3:

https://backpack.tf/item/728228460

Sale 3:

https://backpack.tf/profiles/76561198072441047#!/compare/1767398400/1767484800

https://backpack.tf/profiles/76561198043465434#!/compare/1767225600/1767744000

Bulk for Rack, using there

Sale 4:

https://backpack.tf/profiles/76561198177872379#!/compare/1766361600/1766448000

https://backpack.tf/profiles/76561198072441047#!/compare/1766361600/1766448000

Sold for 280?? (400 keys can be traced on sale 5, but the remainder matches but its only 280)

Item 4:

https://backpack.tf/item/668243324

Sale 5:

https://backpack.tf/profiles/76561198110010874#!/compare/1766361600/1766448000

https://backpack.tf/profiles/76561198072441047#!/compare/1766361600/1766448000

Sold for 400 keys pure (ID 16543265386)

Sale 6:

https://backpack.tf/profiles/76561198072441047#!/compare/1767398400/1767484800

https://backpack.tf/profiles/76561198043465434#!/compare/1767225600/1767744000

Bulk for Rack, using there (Same trade as sale 3)

//

Sellers:

BPTF - https://imgur.com/a/kQc5psj - 1 @ 400, 1 @ 440

MPTF - https://marketplace.tf/items/tf2/54;5;u30 - 1 @ $899.99 (~486)

STN - https://stntrading.eu/item/tf2/Unusual+Blizzardy+Storm+Soldier%27s+Stash - None

SCM - https://steamcommunity.com/market/listings/440/Unusual%20Soldier%27s%20Stash?filter=Blizzardy+Storm - None

Sale(s):

400, 280?, 400

Considering the 280 sale is pretty untrace but also below current buyers I am excluding it from the range.

Going with 400 keys flat