8 sales

1) Haunted Phantasm Disco Fever (15) + 4 keys + 22 ref

https://backpack.tf/profiles/76561198054275169#!/compare/1552780800/1552867200

https://backpack.tf/profiles/76561197994697258#!/compare/1552780800/1552867200

Disco

https://backpack.tf/suggestion/5c77b2bdd3817205a6773062

15 + 4 + 0.5 = 19.5

B/O was 15.

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2) With Bill's Hat (2) + Hot Star Crossed Knife (MW) (?) + Clairvoyance Murderer's Motif (18) for Poisonous Bubbles of Regret The High Five! (22)

https://backpack.tf/profiles/76561198261509772#!/compare/1550793600/1550880000

https://backpack.tf/profiles/76561197994697258#!/compare/1550793600/1550880000

Bulk.

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3) ?

https://backpack.tf/profiles/76561198097816819#!/compare/1550016000/1550188800

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https://marketplace.tf/items/1111;5;u3021

4) $13.12 on February 25th, keys were $1.8

13.12/1.8 ≈ 7 keys

Low.

5) $27.72 on February 27th, keys were $1.79

27.72/1.79 ≈ 15 keys

6) $28 on February 27th, keys were $1.79

28/1.79 ≈ 16 keys

7) $28 on March 3rd, keys were $1.79

28/1.79 ≈ 16 keys

8) $31 on March 15th, keys were $1.8

31/1.8 ≈ 17 keys

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Total: 7, 15, 15, 16, 16, 17

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

New sale: Bulk

https://backpack.tf/profiles/76561198174708907#!/compare/1553299200/1553385600