7 sales

1) The Dark Doorway Murderer's Motif (58) + 23 keys

https://backpack.tf/profiles/76561198113488534#!/compare/1552435200/1552608000

https://backpack.tf/profiles/76561198311873180#!/compare/1552521600/1552608000

Motif

https://backpack.tf/suggestion/5c7c6dfed38172550d6cd165

58 + 23 = 81

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2) Burning Flames Towering Titanium Pillar of Hats (77)

https://backpack.tf/profiles/76561198069174954#!/compare/1549843200/1551052800

Pillar is a bit old, but no other mini found, using this

https://backpack.tf/suggestion/5bbc27fa44325a20226d0846

77

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3) duped Stormy Storm Bonk Boy (38) + Kill-a-Watt Big Elfin Deal (12) + Australium Scattergun (27)

https://backpack.tf/profiles/76561198175420885#!/compare/1548979200/1549152000

https://backpack.tf/profiles/76561198069174954#!/compare/1548979200/1549670400

Bonk sold for 38 keys

https://backpack.tf/profiles/76561198175420885#!/compare/1549152000/1549324800

https://backpack.tf/profiles/76561198059098316#!/compare/1549065600/1549152000

Scattergun

https://backpack.tf/stats/Strange/Australium%20Scattergun/Tradable/Craftable

Elfin sold for 12 keys + 9 ref in items, taking 12

https://backpack.tf/profiles/76561198416395887#!/compare/1546300800/1546473600

https://backpack.tf/profiles/76561198176050261#!/compare/1546214400/1548374400

Thank you, Foamy the Fearsome

38 + 12 + 27 = 77

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4) With Disco Beat Down Hot Dogger (30) for Stormy 13th Hour Hetman's Headpiece (45) + 33 keys

https://backpack.tf/profiles/76561198175420885#!/compare/1548547200/1548633600

Hot Dog

https://backpack.tf/suggestion/5c856c90d381722a89189721

Hetman

https://backpack.tf/suggestion/5c61e555cf6c753f2748b29c

45 + 33 - 30 = 48

Low.

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5) Disco Beat Down Defragmenting Hard Hat 17% (130)

https://backpack.tf/profiles/76561198173404791#!/compare/1548374400/1548547200

Defragmenting Hat sold for StarStorm Slumber Brotherhood of Arms (130)

https://backpack.tf/profiles/76561198093824611#!/compare/1548547200/1548633600

BoA

https://backpack.tf/suggestion/5c3a324244325a48d12ddf43

130

High.

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6) ?

https://backpack.tf/profiles/76561198407541175#!/compare/1548288000/1548374400

https://backpack.tf/profiles/76561198134266699#!/compare/1548288000/1548374400

Can see DBD Dr Dapper with Fez in both links, but can't understand for what it was sold

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7) Cloud 9 Kiss King (52) + Terror-Watt Front Runner (26) + 2 keys

https://backpack.tf/profiles/76561198324455724#!/compare/1547251200/1547424000

https://backpack.tf/profiles/76561198407541175#!/compare/1547337600/1547424000

Kiss King sold for Miami Nights Towering Titanium Pillar of Hats (25) + Morning Glory Titanium Tyrolean (35)

https://backpack.tf/profiles/76561198429587621#!/compare/1546732800/1546819200

Tyrolean

https://backpack.tf/suggestion/5c49cececf6c755a63040763

Pillar of Hats sold for $44.9 on December 27th, keys were $1.79

https://marketplace.tf/items/30008;5;u61

44.9/1.79 ≈ 25 keys

Also king sold for $80 on March 17th, keys were $1.8 (thanks, polar)

https://marketplace.tf/items/30313;5;u58/Ghastly%20Ghosts%20Jr%20Kiss%20King

80/1.8 ≈ 44 keys

This makes king's value at 44-60 (or 52)

Runner sold for $47 on February 18th, keys were $1.79

https://marketplace.tf/items/760;5;u57

47/1.79 ≈ 26 keys

52 + 26 + 2 = 80

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No marketplace sales.

https://marketplace.tf/items/223;5;u46

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Total: 48, 77, 77, 80, 81, 130

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