Sale 1:

Sold to a quickbuyer for 21 keys + some metal

Seller: https://backpack.tf/profiles/76561198093438754#!/compare/1537920000/1538006400

Buyer: https://backpack.tf/profiles/76561198337734785#!/compare/1538006400/1538006400

https://backpack.tf/item/6966511098

X = 21

Sale 2:

Sold to a quickbuyer for 21 keys + some metal

Seller: https://backpack.tf/profiles/76561198081477129#!/compare/1538870400/1539129600

Buyer: https://backpack.tf/profiles/76561198342161127#!/compare/1538697600/1538870400

https://backpack.tf/item/6744100111

X = 21

Sale 3:

Bulk for Burning Glasgow Great Helm

Seller: https://backpack.tf/profiles/76561198049628131#!/compare/1537833600/1537920000

Buyer: https://backpack.tf/profiles/76561198093438754#!/compare/1537833600/1537920000

https://backpack.tf/item/6966511098

Sale 4:

Sold for Purple Confetti Connoisseur’s Cap + some metal

Seller: https://backpack.tf/profiles/76561198297023624#!/compare/1540944000/1543017600

Buyer: https://backpack.tf/profiles/76561198189798126#!/compare/1541548800/1541808000

https://backpack.tf/item/6817452099

Using on the Cap.

Sale 5:

Untraceable

Seller: https://backpack.tf/profiles/76561198394965271#!/compare/1544054400/1544140800

Buyer: https://backpack.tf/profiles/76561198342161127#!/compare/1544054400/1544140800

https://backpack.tf/item/6817452099

Sale 6:

Untraceable

Seller: https://backpack.tf/profiles/76561198121916180#!/compare/1537833600/1539129600

Buyer: https://backpack.tf/profiles/76561198337734785#!/compare/1537747200/1537833600

https://backpack.tf/item/6804023655

https://backpack.tf/item/6418761748 - nothing usable here

Sellers:

https://i.imgur.com/Lgc6WPs.png

https://backpack.tf/item/6804023655 - 23 keys

https://backpack.tf/item/6761147959 - 24 keys

Sales at:

21 (2x)

No buyers at 21 currently. Should be fine to use.

Going with 21 flat.