Credits to the lazy and sleepy Julia for the first 2 sales.

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Sold for Smoking Dread Knot (.6) + Smoking Charmer's Chapeau (1.45) + Disco Beat Down Bootleg Base Metal Billycock (1.3):

http://www.tf2outpost.com/trade/24732865

(.6 + 1.45 + 1.3) * .9 = 3.015 buds

Rounded to 3 buds

Disco Beat Down Bootleg Base Metal Billycock mini:

~1.3 buds

Quicksold for 25 keys (1.67 buds):

http://www.tf2outpost.com/trade/24602891

Seller's Backpack Before: http://backpack.tf/profiles/76561198129362341?time=1421049600

Seller's Backpack After: http://backpack.tf/profiles/76561198129362341?time=1421395200

Sold for Green Energy Ye Oiled Baker Boy (2.74):

http://backpack.tf/item/3038128475

http://backpack.tf/item/3325162499

2.74 * .9 = 2.466 buds

Rounded to 2.5 buds

History of backpack was weird.

Sold for Kill-a-Watt Tartan Tyrolean (2.3):

http://backpack.tf/profiles/76561198073007033?time=1420835289

http://backpack.tf/profiles/76561198073007033?time=1420876800

2.3 * .9 = 2.07 buds

Rounded to 2.1 buds

The sale occurred before KaW Tyrolean was updated. Its price, however, was extremely overpriced. Mean value of the new price and the old price was used here.

Sold for Strange Specialized Killstreak Australium Medi Gun (2.3):

http://backpack.tf/profiles/76561198073007033?time=1418371200

http://backpack.tf/profiles/76561198073007033?time=1418457600

2.3 * .9 = 2.07 buds

Rounded to 2.1 buds

Normal Aussie Medigun was priced at ~2.2 buds at that time.

Sold for Stormy Storm Towering Pillar of Hats (2.9):

http://www.tf2outpost.com/trade/23995480

http://backpack.tf/profiles/76561198153188810?time=1417334400

http://backpack.tf/profiles/76561198153188810?time=1417833338

Owner offered. 2.9 buds

Supporting sale:

Sold for duped Haunted Ghosts Ye Olde Baker Boy (3.25 * .9):

http://backpack.tf/profiles/76561198060973105?time=1421881705

http://backpack.tf/profiles/76561198060973105?time=1421740800

3.25 * .9 * .9 = 2.6325 buds

Rounded to 2.6 buds

Ghosts Baker Boy needs a drop.