2 sales

1) For duped Haunted Ghosts Grimm Hatte (45)

https://backpack.tf/profiles/76561198095231098#!/compare/1545782400/1546041600

https://backpack.tf/profiles/76561198134939963#!/compare/1545955200/1546041600

HG Grimm Hatte sold for 45 keys

https://backpack.tf/profiles/76561198086178920#!/compare/1548633600/1549238400

https://backpack.tf/profiles/76561198866419663#!/compare/1549238400/1549324800

2) With Strange Kritzkrieg (20) + Professional Australium Minigun (44) for Strange Hot Professional Buffed Tiger Minigun (FT) (?) + 7 keys

https://backpack.tf/profiles/76561198134512931#!/compare/1548633600/1548720000

https://backpack.tf/profiles/76561198333956354#!/compare/1548288000/1548720000

Not using due to no mini for unusual mingun; better to price the minigun I guess.

No marketplace sales.

https://marketplace.tf/items/30547;5;u18

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*EDIT

As Paradise ♡ recommended, found another mini that includes duped grimm hatte (46). Probably 1 key don't affect too much.

Mini for duped Grimm Hatte:

Sold for Circling Peace Sign Spook Specs (44) + 2 keys

https://backpack.tf/profiles/76561198097271466#!/compare/1545177600/1545264000

CPS Spook Specs sold for Cloud9 Hat of Cards (23) + Neutron Star Ye Oiled Baker Boy (21)

https://backpack.tf/profiles/76561198134939963#!/compare/1544659200/1544745600

C9 HoC sold for $37.99 on 14th of December, keys were $1.64

https://marketplace.tf/items/825;5;u58

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

37.99/1.64 = ~23 keys

NS Ye Oiled Boy sold for Aces High Cloud Crasher (19) + 2 keys

https://backpack.tf/profiles/76561198310374315#!/compare/1543708800/1543881600

AH Cloud Crasher sold for $33.99 on 25th of February, key were $1.80

https://marketplace.tf/items/30071;5;u59

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

33.99/1.8 = ~19 keys

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Total: 45

If you will find another sales - you're welcome to report them.