Fixing previous suggestion. Proof is the same, but prices adjusted for correctness.

Not entirely sure if the first sale should be kept because there was 0 negotiation.

1. 45 keys pure

http://backpack.tf/profiles/76561198057809362?time=1434265200 (June 14th)

http://backpack.tf/profiles/76561198057809362?time=1437116400 (July 17th)

2. KaW Tossle (outdated - 36k)

+ Overclocked Hallmark (22k)

+ tradable Black Rose (outdated - 10 keys)

+ Spec KS Festive Black Box w/ parts (4 keys)

+ 2 keys pure

http://i.imgur.com/btiAUyW.png

(36 + 22 + 10 + 4) * 0.9 + 2 keys = 65 (64.8) + 2 = 67 keys

KaW Tossle mini:

Sold for 36 keys pure after putting it up on Classifieds for 3 days -

http://i.imgur.com/lsFfTuz.png

Black Rose mini:

Buyer at 9.5 (Classifieds), unsold at 11 keys and up. At the time of the sale lowest classified listing was 12 keys so this should be fine

http://i.imgur.com/8VPXWHO.png

Black Box mini:

SCM sales at $8.5-9: http://steamcommunity.com/market/listings/440/Strange%20Specialized%20Killstreak%20Festive%20Black%20Box

Keys currently at $2.47, so ~3.3 keys.

However, item has about 8 keys in parts ( http://backpack.tf/item/2183948736 ) as well, so rounding to 4 keys (probably undervalued but doesn't matter much).