Reeeeeeed Robin.

http://backpack.tf/item/214783813

Sale 1) Sold + Specialized Killstreak Festive Huntsman (~1 Key) for a Cauldron Bubbles Professional's Panama (23 Keys)

http://backpack.tf/profiles/76561198228991628#!/compare/1473120000/1473206400

23 - 1 = 22 Keys

Sale 2) Sold for a Circling Peace Sign Tartan Spartan

http://backpack.tf/profiles/76561198033497056#!/compare/1474675200/1474761600

http://www.tf2outpost.com/trade/28505253 - Spartan had a Buyout of 23 Keys

Sale 3) Sold for a Green Confetti Furious Fukaamigasa

http://backpack.tf/profiles/76561198033497056#!/compare/1474761600/1475107200

http://www.tf2outpost.com/trade/28519175 - The Seller then had a Buyout of 21 Keys for the Fukaamigasa

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http://backpack.tf/item/267340172

Sale 4) Sold for a Green Energy Football Helmet (22.5 Keys) + ~1 Key of Items

http://backpack.tf/profiles/76561198125791160#!/compare/1473292800/1473379200

22.5 + 1 = 23.5, which rounds to 24 Keys

Sale 5) Sold + Professional Killstreak Quick-Fix (~3 Keys) for a KS Australium Scattergun (~27 Keys)

http://backpack.tf/profiles/76561198291254007#!/compare/1474934400/1475020800

27 - 3 = 24 Keys

http://backpack.tf/item/281778064

Sale 6) Sold for 19 Keys

http://backpack.tf/profiles/76561198259128870#!/compare/1475107200/1475280000 - Buyer’s Backpack

Sale 7) Sold for 20 Keys

http://backpack.tf/profiles/76561198259128870#!/compare/1476748800/1477094400