Suggesting on behalf of Explocivo, credit to the for most of the sales.

This is a re-suggest, using sales from the last suggestion onwards:

Item 1

https://backpack.tf/item/1232974569

Ignoring the trade-back between Killa and Panic

Sale #1

Sold for 515 keys (ID "13997873827" of the unusual matches)-

Seller: https://backpack.tf/profiles/76561198253093948#!/compare/1703980800/1704153600

Buyer: https://backpack.tf/profiles/76561198147024042#!/compare/1704067200/1704153600

Sale #2

Gambled?-

Seller: https://backpack.tf/profiles/76561198147024042#!/compare/1704153600/1704240000

Buyer: https://backpack.tf/profiles/76561199139394142#!/compare/1704153600/1704240000

Sale #3

Gambled-

Seller: https://backpack.tf/profiles/76561199139394142#!/compare/1704758400/1704844800

Buyer: https://backpack.tf/profiles/76561199161916038#!/compare/1704672000/1704758400

Sale #4

Gambled again-

Seller: https://backpack.tf/profiles/76561199161916038#!/compare/1704758400/1704844800

Buyer: https://backpack.tf/profiles/76561199549962642#!/compare/1704758400/1704844800

Sale #5

Gambled?-

Seller: https://backpack.tf/profiles/76561199549962642#!/compare/1704758400/1704844800

Buyer: https://backpack.tf/profiles/76561199139394142#!/compare/1704758400/1704844800

Sale #6

Gambled-

Seller: https://backpack.tf/profiles/76561199139394142#!/compare/1704844800/1704931200

Buyer: https://backpack.tf/profiles/76561198029534325#!/compare/1704844800/1704931200

Sale #7

Bulk sale-

Seller: https://backpack.tf/profiles/76561198029534325#!/compare/1705104000/1705190400

Buyer: https://backpack.tf/profiles/76561198167149339#!/compare/1705017600/1705190400

Sale #8

Sold with a Blizzardy Storm Master's Yellow Belt (212.5 keys) for an Arcana Tartan Spartan (680 keys) + 20 keys (ID "14084482448" of the unusual matches) = 487.5ish keys-

Seller: https://backpack.tf/profiles/76561198310972287#!/compare/1705968000/1706054400

Buyer: https://backpack.tf/profiles/76561198220098345#!/compare/1705968000/1706054400

Sale #9

Bulk sale-

Seller: https://backpack.tf/profiles/76561198220098345#!/compare/1707436800/1707523200

Buyer: https://backpack.tf/profiles/76561199446225302#!/compare/1707177600/1707523200

Sale #10

Sold for 450 keys

https://backpack.tf/profiles/76561198093114319#!/compare/1705276800/1705449600

https://backpack.tf/profiles/76561198310972287#!/compare/1705363200/1705449600

Sales @ 450, 488, 515

Seller at 450

https://imgur.com/a/bukww3G

https://backpack.tf/item/1232974569

Not rounding and taking 450-515 here >:3