Here's a doozy.

http://backpack.tf/item/3367605358

Sale 1) Sold + 1 Key for a Sunbeams Napoleon Complex

http://backpack.tf/profiles/76561198317522580#!/compare/1473897600/1473984000

Explained at the bottom. Using for the Napoleon.

Sale 2) Sold for ~72 Keys of Items + Cloud 9 Professor's Peculiarity + 12 Keys

http://backpack.tf/profiles/76561198021308963#!/compare/1473897600/1473984000 - Buyer's Backpack

http://backpack.tf/profiles/76561198139171368#!/compare/1473897600/1473984000 - Seller's Backpack

http://www.tf2outpost.com/trade/28491612 - Capped by the Buyout of 85 Keys

Sale 3) Sold + Circling Hearts Glasgow Great Helm (45 Keys) for a Circling TF Logo Well-Wrapped Hat (107 Keys)

http://backpack.tf/profiles/76561198021308963#!/compare/1474848000/1474934400

107 - 45 = 62 Keys

Glasgow Mini

http://backpack.tf/suggestion/57f0638683de6b1b214b9044 - 45 Keys

Well-Wrapped Mini

http://backpack.tf/suggestion/57f06c4c83de6b3e5766b11c - 107 Keys

Sale 4) Sold + Circling Hearts Glasgow Great Helm (45 Keys) + 3 Keys for a Sunbeams Stainless Steel Pot (120 Keys)

http://backpack.tf/profiles/76561198115721685#!/compare/1474934400/1475020800 - Seller's Backpack

http://backpack.tf/profiles/76561198217905536#!/compare/1474934400/1475020800 - Buyer's Backpack

120 - 48 = 72 Keys

Glasgow Mini

http://backpack.tf/suggestion/57f0638683de6b1b214b9044 - 45 Keys

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Here's the story.

The Blizzardy Storm Tipped Lid + Key went from A Red Brick to Voldemort for the Napoleon, and then the Lid went from Voldemort to Mr Turtle.

http://backpack.tf/item/3367605358 - Tipped Lid

http://backpack.tf/profiles/76561198021308963#!/compare/1473897600/1473984000 - Turtle receiving the Lid.