Re-re-suggestion. (I thought I messed up but I didn't.) Let's go. (#4.)

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http://www.tf2outpost.com/trade/20428709#my - Sold for Terror-Watt El Jefe (3.85 * 0.9 = ~3.5 buds)

http://i.imgur.com/2x8BxT9.png

Thanks to [EC] Zypher ❀ for the sale.

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http://i.imgur.com/CgFQ1x0.png - Sold for Terror-Watt Sergeant's Drill Hat (2.6 * 0.9 = ~2.3 buds)

Most likely an outlier. Thanks Zypher, again

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http://i.imgur.com/Gcc9FdS.png - Sold for Miami Belgian + Bills Hat (5.4 keys) + 19 keys ((1.85 * 0.9 = 1.67) + (24.4 / 18 = 1.33) = ~3 buds)

Daaamn that maths tho. ZYPHER AGAIN TY

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http://www.tf2outpost.com/trade/20758665 - Sold for Circling TF Logo Blighted Beak (outdated)

Outdated. Also these beaks are dodgy. Probably an outlier regardless.

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Calling 2.3 an outlier - 3 to 3.5 seems the best range. Thank you! :)