Mini this way comes.

Sale 1

Sold for 43 keys

http://backpack.tf/profiles/76561198047573393#!/compare/1470873600/1470960000

http://www.tf2outpost.com/trade/28366467 ----- No B/O, buyer offered there.

=======> 43 keys

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Sale 2

Sold for a Sulphurous Gatsby

http://backpack.tf/profiles/76561198104321004#!/compare/1470268800/1470441600

No Outpost trade.

Should be used for the Gatsby

=======> Not using

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Sale 3

Sold for a DBD Dragonborn (mini at 23) + TWatt Berliner's (outdated at 16) + ~8 keys in sweets

http://backpack.tf/profiles/76561198158831132#!/compare/1469404800/1469491200

http://www.tf2outpost.com/trade/28224140 ----- B/O was 40 keys

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Mini for the Dragonborn: Young seller for 23 keys

http://imgur.com/a/gTBEk

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This sale will easily cap at the B/O.

=======> Capped at 40 keys

======================================================

Sellers

- http://imgur.com/a/lWKtD ----- 40 keys for 2 months.

Summary

- Sales for 40, 43.

- Seller for 40.

I'm going to cap the highest sale given the unsold and go with 40 keys. There are two sales for that number, so it should represent the common trading point.

Criticism appreciated!