Small train.

Sale 1

Sold for 35 keys

http://backpack.tf/profiles/76561198071365493#!/compare/1477440000/1477526400

http://www.tf2outpost.com/trade/28556298 ----- B/O was removed, took a while.

=======> 35 keys

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Sale 2

Sold with 20 keys for a DBD Tossle.

http://backpack.tf/profiles/76561198095022965#!/compare/1479081600/1479254400

http://www.tf2outpost.com/trade/28607719 ----- B/O was 39 keys

Using on DBD Tossle, although it supports 35 here.

=======> Not using

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Sale 3

No idea

http://backpack.tf/profiles/76561198056318195#!/compare/1477872000/1482105600

http://backpack.tf/profiles/76561198086976427#!/compare/1479427200/1479513600

http://www.tf2outpost.com/trade/28560110 ----- B/O was 37 keys

=======> Not using

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

Sale 4

Sold for a PE Birdcage (mini at -at least- 34 keys) + 5 keys

http://backpack.tf/profiles/76561198056318195#!/compare/1477094400/1477180800

http://www.tf2outpost.com/trade/28538940 ----- B/O was 39 keys

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Mini for the Birdcage: Should easily be above 34 keys

http://backpack.tf/profiles/76561198211995121#!/compare/1481241600/1481328000

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=======> Capped at 39 keys

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Sellers

- http://imgur.com/a/0LmNv ----- 40 keys for a month.

Summary

- Sales for 35, 39.

Going with 35-39 keys. Criticism appreciated!