Lighting + Electric = Theme

http://backpack.tf/item/4220148538

Sale 1) Sold for Strange Parts worth 7 Keys at the time

http://backpack.tf/profiles/76561198105359319?time=1447488000

http://backpack.tf/profiles/76561198105359319?time=1447574400

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Sale 2) Quicksold for 9 Keys

http://backpack.tf/profiles/76561198211717085?time=1448611200

http://backpack.tf/profiles/76561198211717085?time=1448697600

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Sale 3) Sold for a Pro KS Aussie Blutsauger (~16 Keys)

http://backpack.tf/profiles/76561198044195191?time=1448784000

http://backpack.tf/profiles/76561198044195191?time=1448870400

The Quicksell at 9 Keys cancels the 7 Key Sale, so I'm going with 16 Keys.

http://www.tf2outpost.com/trade/27675357 - Seller at 15 Keys