Ohhhh boy.

http://backpack.tf/item/5206392384

Sale 1) Sold for a Kill-a-Watt L'Inspecteur (13.5 Keys) + 1 Key

http://backpack.tf/profiles/76561198050351848#!/compare/1490659200/1490745600

High Outlier.

L'Inspecteur Mini

http://backpack.tf/suggestion/59264a340e2cad1c496bfdd5 - 13.5 Keys

http://backpack.tf/item/5534524231

Sale 2) Sold for 9 Keys + ~2 Keys of Items

http://backpack.tf/profiles/76561198289322711#!/compare/1492646400/1492819200

9 + 2 = 11 Keys

http://backpack.tf/item/5333684755

Sale 3) Sold for 15 Keys

http://backpack.tf/profiles/76561198309246958#!/compare/1491004800/1491091200

High Outlier.

http://backpack.tf/item/5250376432

Sale 4) Sold for 12 Keys

http://backpack.tf/profiles/76561198045609485#!/compare/1490918400/1491004800

http://backpack.tf/item/5247448358

Sale 5) Sold for 11 Keys

http://backpack.tf/profiles/76561198254260997#!/compare/1493510400/1493942400 - Buyer's Backpack

http://backpack.tf/item/5233354343

Sale 6) Quicksold for 11 Keys

http://backpack.tf/profiles/76561198028072716#!/compare/1491868800/1491955200

http://backpack.tf/item/5223065162

Sale 7) Sold for 12 Keys

http://backpack.tf/profiles/76561198060580457#!/compare/1490659200/1490918400

http://backpack.tf/item/5220505290

Sale 8) Sold for 11 Keys

http://backpack.tf/profiles/76561198057999477#!/compare/1495324800/1495411200

http://backpack.tf/item/5219424264

Sale 9) Sold for 10 Keys + ~1 Key of Refined

http://backpack.tf/profiles/76561198183738670#!/compare/1493164800/1493337600

10 + 1 = 11 Keys