One part of the massive suggestion that I'm making here later tonight.

Only sale that I can only find and luckily, it was a pure sale.

#MiniSuggestionForBigSuggestion

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The Sales

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http://www.tf2outpost.com/trade/25168575 - Sold for 5 Buds (60 Keys) + 6 Keys + 1 Key in Sweets. (67)

Proof:

http://backpack.tf/profiles/76561198095213521?time=1424678400

http://backpack.tf/profiles/76561198095213521?time=1424764800

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Good majority of other sales have been for bulk sales.