Free premium raffle plug: http://forums.backpack.tf/index.php?/topic/45755-premium-giveawayraffle/

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Appears to have sold for a miami nights professor's peculiarity (22-23) and 1 key = (22.5 * 0.9) + 1 = 21 keys

Seller before: http://backpack.tf/profiles/76561198095177451?time=1448611200 (November 27th)

Seller after: http://backpack.tf/profiles/76561198095177451?time=1448697600 (November 28th)

Compare link: http://backpack.tf/profiles/76561198095177451?time=1448697600&compare=1448611200

Buyer before: http://backpack.tf/profiles/76561198220534416?time=1448697600 (November 28th)

Buyer after: http://backpack.tf/profiles/76561198220534416?time=1448784000 (November 29th)

Compare link: http://backpack.tf/profiles/76561198220534416?time=1448784000&compare=1448697600

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Sellers/unsold:

http://www.tf2outpost.com/trade/27511047 30 keys, 2 weeks

http://www.tf2outpost.com/trade/27566273 32 keys, 1 week (badly bumped)

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This is the only halfway usable sale I can make any sense of. Feedback and additional proof is welcome.