http://www.tf2outpost.com/trade/8225125 - 6 days old

B/O : 76 Keys (2.81 Buds)

C/O : 2.5 Buds by ~UTFB~ Koga, rejected

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http://www.tf2outpost.com/trade/7570501 - 1 month old

B/O : 3.5 Buds

C/O : 3 Buds by Donaldfish (3 weeks ago, retracted)

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http://www.tf2outpost.com/trade/7291497 - 1 month old

B/O : 4 Buds

C/O : 3 Buds by ExplodingMarshmallow (3 weeks ago)

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http://www.tf2outpost.com/trade/5530225 - 3 months old

B/O : ???

C/O : 2.6 Buds by {NâCG} J-AFK Man (just 20 hours ago)

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http://www.tf2outpost.com/trade/8369343 - Just 8 hours ago

B/O : 3 Buds

C/O : none yet

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http://www.tf2outpost.com/trade/8206445 - 1 week ago

B/O : 3 Buds

C/O : 2 Buds + Black Bill + TS Bill (about 2.6 buds) by Unicorn - 1 week ago

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Highest Price is based on two 3 Buds B/O, and one 2.81 Buds B/O

Although B/O means nothing, I guess it's good for correcting current price (3.6 Buds)