"Feel free to take this and resuggest if you'd like. Too lazy"

Resuggesting since I modified the cockswain suggestion afterwards

Credits for most of the proof to jun | 78 MBPS DOWNLOAD SPEED :D

The sales

Sale 1:

Sold for dbd liq.lid (~27) + ~3 keys in sweets

http://backpack.tf/profiles/76561198088680896?time=1441508724 before

http://backpack.tf/profiles/76561198088680896?time=1441522800 after

0.9*(27+3) = ~27

-> 27 keys

Sale 2:

Sold for miami cockswain (~25)

http://www.tf2outpost.com/trade/26357778 offered here [Listed as CO]

http://backpack.tf/profiles/76561198045110667?time=1440559616 before

http://backpack.tf/profiles/76561198045110667?time=1440572400 after

offered, no overpay

-> 25 keys

Sale 3:

QSed for 21 probably

[No OP]

http://backpack.tf/profiles/76561198202369941?time=1438412400 before

http://backpack.tf/profiles/76561198202369941?time=1438498800 after

This sale is over 3 months old by now anyway

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Sale 4:

Sold for duped ss stainless pot (~22)

http://backpack.tf/profiles/76561198061174419?time=1445410800 before

http://backpack.tf/profiles/76561198061174419?time=1445497200 after

0.9*22 = ~20

-> 20 keys

Sale 5:

Sold for c9 festivizer (~35)

http://www.tf2outpost.com/trade/26302354 "offered" here, although the comment indicates the c9 was offered to him first

http://backpack.tf/profiles/76561198043734778?time=1442161159 before

http://backpack.tf/profiles/76561198043734778?time=1442386800 after

0.9*35 = ~32

-> 32 keys

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Sales at:

20

21 [outdated]

25

27

32

20 is probably a low outlier seeing how 21 was achieved without outpost listing. 32 is probably an outlier:

http://www.tf2outpost.com/trade/27387790 30

http://www.tf2outpost.com/trade/27408742 28

Classified listings at 30

Previous BOs at 30

Gonna cut off those 2 from the range, making a range 25-27

Constructive criticism weclome!

~Foamy :3