3 sales

1) With 2 keys for Starstorm Insomnia Frontier Djustice (19)

https://backpack.tf/profiles/76561198284637591#!/compare/1552262400/1552694400

https://backpack.tf/profiles/76561198244913000#!/compare/1552435200/1552694400

Djustice

https://backpack.tf/suggestion/5c8c490d678072717e1574a7

19 - 2 = 17

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2) With 1 key for Death at Dusk Magnificent Mongolian

https://backpack.tf/profiles/76561198244913000#!/compare/1552176000/1552262400

https://backpack.tf/profiles/76561198085931736#!/compare/1552262400/1552435200

Better to use on mongolian.

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3) 22 keys

https://backpack.tf/profiles/76561198129983381#!/compare/1552089600/1552176000

https://backpack.tf/profiles/76561198085931736#!/compare/1552003200/1552176000

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No marketplace sales.

https://marketplace.tf/items/111;5;u32

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Total: 17, 22

If you will find other sales, you're welcome to report them.