Item 1:

https://backpack.tf/item/2757109502

Sale 1:

Sold for 25 Keys (Buyer's side shows the keys)

https://backpack.tf/profiles/76561199059698603#!/compare/1733356800/1733443200

https://backpack.tf/profiles/76561198803709694#!/compare/1733356800/1733529600

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Item 2:

https://backpack.tf/item/12005137862

Sale 2:

Sold for 25 Keys (Unusual ID: "15099787632")

https://backpack.tf/profiles/76561198271577665#!/compare/1730419200/1730678400

https://backpack.tf/profiles/76561199225810048#!/compare/1730592000/1730678400

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Item 3:

https://backpack.tf/item/7909156568

Sale 3:

Bulk

https://backpack.tf/profiles/76561198260163913#!/compare/1732406400/1732492800

https://backpack.tf/profiles/76561199183171982#!/compare/1732406400/1732492800

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Item 4:

https://backpack.tf/item/3260746710

Sale 4:

Bulk

https://backpack.tf/profiles/76561198042546726#!/compare/1728172800/1729987200

https://backpack.tf/profiles/76561198056793885#!/compare/1729900800/1729987200

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Item 5:

https://backpack.tf/item/2771574404

Sale 5:

2 rec traceable

https://backpack.tf/profiles/76561198183796462#!/compare/1728432000/1729123200

https://backpack.tf/profiles/76561199102777012#!/compare/1729036800/1729123200

Sale 6:

Sold for 26 Keys (Unusual ID: "15231164016")

https://backpack.tf/profiles/76561199102777012#!/compare/1733961600/1734048000

https://backpack.tf/profiles/76561198013340645#!/compare/1733788800/1734048000

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Item 6:

https://backpack.tf/item/12021304234

Sale 7:

Sold for 20 Keys? (Counted from buyer's side; keys were used to trade for Radiant Rivalry Brimmed Bootlegger)

https://backpack.tf/profiles/76561198292329539#!/compare/1728432000/1730160000

https://backpack.tf/profiles/76561198849824904#!/compare/1727913600/1728518400

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Marketplace.TF Sales:

https://marketplace.tf/items/tf2/1118;5;u3098

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

Sale 8:

https://backpack.tf/item/3414204484

$58.99/$1.80 = ~33 Keys (Nov 13)

Sale 9:

$49.99/$1.76 = ~28 Keys (Dec 6)

Sale 10:

https://backpack.tf/item/12182000778

$49.99/1.80 = ~28 Keys (Dec 27)

//

Total Sales

20, 25, 25, 26, 28, ,28, 33

https://imgur.com/ABUB6JH

33 is too high with sellers @ $49.99

Taking 20 - 28 Keys

Unsolds:

https://backpack.tf/item/11692264434 — $49.99

https://backpack.tf/item/11736049335 — $49.99

https://backpack.tf/item/7909156568 — $49.99

https://backpack.tf/item/11098709820 — $58.99

https://backpack.tf/item/3004793660 — $58.99