Oh look, a drama-less suggestion!

Sale 1

Sold for 29 keys.

http://backpack.tf/profiles/76561198078923591#!/compare/1467504000/1467590400 (sort by time)

http://www.tf2outpost.com/trade/28288744 ----- B/O was 29 keys

=======> 29 keys

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

Sale 2

Sold with 5 keys for a Pro. Ks. Aussie Wrench (mini at 29)

http://backpack.tf/profiles/76561198136981355#!/compare/1466640000/1466726400

http://backpack.tf/profiles/76561198078923591#!/compare/1466640000/1466726400 (sort by time to see the keys here)

No Outpost trade.

Mini for the Wrench: sellers for 29 keys, taking 29 keys. http://imgur.com/a/kcj6p

=======> 29 - 5 = 24 keys

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

Sale 3

Sold for a Searing Buckaroos (mini at 15) + 12 keys

http://backpack.tf/profiles/76561198081172172#!/compare/1465344000/1465430400 (sort by time)

http://www.tf2outpost.com/trade/28239293 ----- B/O was 27 keys

Mini for the Buckaroos: Sold for 15 keys

http://backpack.tf/profiles/76561198158457831#!/compare/1467763200/1467849600

=======> 27 keys

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

Sale 4

Bulk.

http://backpack.tf/profiles/76561198081172172#!/compare/1465257600/1465344000

http://backpack.tf/profiles/76561198113953350#!/compare/1464998400/1465344000

=======> Not using

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

Sellers

- http://www.tf2outpost.com/trade/28326933 ----- No B/O

Summary

- Sales for 24, 27, 29.

Going with 24-29 keys. Criticism appreciated!