"~~~INTERMEZZO~~~"

Countering both open suggestions as I believe both are inaccurate

Credits to ๖ۣۜTrafalgar Law [⇄] and CBG

The sales:

Sale 1:

Sold for peace sign fez (~14) + 2 ToD tix (0.8) + strange scatter (0.3)

http://www.tf2outpost.com/trade/25734807

http://backpack.tf/profiles/76561198045523714?time=1429378275 before

http://backpack.tf/profiles/76561198045523714?time=1429426800 after

http://gyazo.com/96e5f5c8a7e821b552aa840651ec3248 [credits to the other sgsts]

0.9*14.3 + 0.8 = ~14

-> 14 keys

Sale 2:

Scm sale (~10 keys)

http://www.tf2outpost.com/trade/25594584

http://gyazo.com/8df4e40ace6f33a0b9e227656d92ed5b

Since there's two other regular in-game sales, Im gonna exclude this

Sale 3:

Sold for pro ks s. direct hit/mantreads/escape plan (8) + 11 keys

http://www.tf2outpost.com/trade/25746189 (was relisted later)

http://backpack.tf/profiles/76561198123359692?time=1429589748 before

http://backpack.tf/profiles/76561198123359692?time=1429858800 after

http://i.imgur.com/EOwQG6d.png [Credits to other suggester]

8+11 = ~19 keys

-> 19 keys

Sale 4:

Sold without a bump for a pro ks big kill (9)

http://www.tf2outpost.com/trade/25416387

http://backpack.tf/profiles/76561198170686275?time=1426738082 before

http://backpack.tf/profiles/76561198170686275?time=1426748400 after

-> 9 keys QS

Mini pro ks stranges:

http://imgur.com/VvoKz01

Direct hit: avg ~6€ => ~2.5 keys

mantreads: avg ~7€ => 3 keys

escape: avg ~5-7€ => 2.5 keys

Total: 8 keys

Taking 8

Mini big kill:

http://imgur.com/lbmAK6z averagely sells around ~20€ => ~9 keys

Taking 9

Currently for sale at 20:

http://www.tf2outpost.com/search/246480881

Final range: 14-19 keys

Constructive criticism welcome!

~Foamy :3