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http://backpack.tf/profiles/76561198106103977?time=1406419910 and http://backpack.tf/profiles/76561198106103977?time=1406444400 - Sold for an Orbiting Fire Bombing Run (15 * 0.9 = 13.5 rounded to 14 keys).
http://www.tf2outpost.com/trade/19395557 - Added a Strange Australium Ambassador (0.9 buds, or or 16 keys at the time) for an Orbiting Fire Company Man (1.75 * 0.9 = 1.575 rounded to 1.6, or 28.8 rounded to 29 keys at the time). 29 - 16 = 13 keys.
http://www.tf2outpost.com/trade/19750003 - Sold for a Pro KS Australium Force-A-Nature + Pro KS Collector's Shortsop. Likely worth over 20 keys for the sale.
Neither of the latter two sales are valid, as they're over 2 months old (and the Company Man's price is outdated), but nonetheless the former supports the first sale, and establishes the latter as an outlier. Not to mention, Overclocked is worth 14 keys as well.