Only 2 viable sales I could discern.

Sale 1:

24 keys (Sapper was not included in sale)

http://gyazo.com/3aa2a7b3f3a62b897c9ca458637db53a

BP before/after:

http://backpack.tf/profiles/76561198139444147?time=1423900800

http://backpack.tf/profiles/76561198139444147?time=1423987200

Sale 2:

Sold with ~9 keys in items after overpay for a TF Logo Bubble Pipe

Spy-Cicle is Pro KS - ~3 keys: http://gyazo.com/e75c2bcbc7d07fcd9c591f064fbe5cfe

Degreaser is Spec KS - ~ 3 keys: http://gyazo.com/500e62d9a0c9d7ed27db299a4380f08c

Items: 3 + 3 + 3 + 12 ref, ~9 keys after overpay

33 - 9 = 24

BP before/after:

http://backpack.tf/profiles/76561198139444147?time=1424332800

http://backpack.tf/profiles/76561198139444147?time=1424419200

Mini on Bubble Pipe:

Sold for Vivid Nano + ~1 key in sweets 36(0.9) + 1(0.9) = ~33

http://gyazo.com/bec3ed7b2fd8f2d5d99b8f2ab880500c

BP before/after:

http://backpack.tf/profiles/76561198139444147?time=1424592000

http://backpack.tf/profiles/76561198139444147?time=1424764800

Sale 3: (Outlier)

Sold with a Hellfire Glengarry for a Max's + 16 keys (Axtinguisher, Flame Thrower, and received keys were not involved in the trade)

Max's = 37 keys at the time of sale

53 - 39.5 = ~13

http://gyazo.com/76b6b8686adcb4fe83c647bea5412dfa

BP before/after:

http://backpack.tf/profiles/76561198049479541?time=1425715200

http://backpack.tf/profiles/76561198049479541?time=1425801600

Let me know if I need to fix something