Item 1: https://backpack.tf/item/216071013

Sale 1: 420k

https://backpack.tf/profiles/76561198158206236#!/compare/1771545600/1771632000

https://backpack.tf/profiles/76561198084758995#!/compare/1771545600/1771632000

Item 2: https://backpack.tf/item/471898477

Only movement is a tradeback, excluding.

Item 3: https://backpack.tf/item/242244732

Sale 1: Marketplace sale, will be listed below.

Item 4: https://backpack.tf/item/281024756

Sale 1: Bulk

https://backpack.tf/profiles/76561199044255861#!/compare/1766534400/1766707200

https://backpack.tf/profiles/76561198063640894#!/compare/1766534400/1766707200

Sale 2: Untrace, looks like it was pulled off Marketplace and traded alongside a GFetti Soldier's Stash, but no Marketplace sales, nothing outgoing, likely cash (or just untrace, lol)

https://backpack.tf/profiles/76561198063640894#!/compare/1772064000/1772150400

https://backpack.tf/profiles/76561198108388792#!/compare/1772064000/1772150400

Marketplace sale:

https://marketplace.tf/items/tf2/339;5;u7

Sold for $792 on Jan. 30th

https://marketplace.tf/items/tf2/5021;6

Key price Jan. 30th is $1.85

$792/$1.85 = 428.11k

Classifieds link: https://imgur.com/a/FGDEdLa

Sales at 420k and 428.11k, taking 420k for low end and 428.11k rounded to 428k for the high end.