All credits to Regi, I had to suggest since his vote power wasn't enough. Re-suggesting for the third time :/

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Sale 1: Sold for a Circling Peace Sign Mask of the Shaman(31 buds) & Molten Mallard Virtual Viewfinder(26.5 buds)

The Item: http://backpack.tf/item/3613761127

The Trade: http://www.tf2outpost.com/trade/23885390

Seller: http://backpack.tf/profiles/76561198025468727?time=1423728000

Buyer: http://backpack.tf/profiles/76561198107358473?time=1423728000

Shaman: http://backpack.tf/item/965504700

Viewfinder: http://backpack.tf/item/3268914538

31*0.9=27.9

26.5*0.9=23.85

27.9+23.85=51.75 rounding up to 51.8

51.8 looks nasty, so 52 it is :)

52 buds converting to keys

52*12=624 keys

Buds were 12 keys at that period of time: http://backpack.tf/vote/id/54dbfe63b98d8841718b4706

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If I did anything wrong, please let me know =D