This was one of my first unusual suggestions 3 months ago, and it took me 7 attempts to get it right back then!

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Sale 1

Sold with green confetti chieftan's challenge, 1 key and ~4 key sweets for purple confetti killer's kabuto - this is the only useable recent sale for the kabuto so going to use it to update that

http://www.tf2outpost.com/trade/26302419

Buyer before: http://backpack.tf/profiles/76561198045941055?time=1435388400 (June 27th)

Buyer after: http://backpack.tf/profiles/76561198045941055?time=1435474800 (June 28th)

Compare link: http://backpack.tf/profiles/76561198045941055?time=1435388400&compare=1435474800

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Sale 2

Sold for bubbling slick cut (15) and scorching flames hard counter (24) = (24 + 15) * 0.9 = 35 keys

Buyer before: http://backpack.tf/profiles/76561198108562502?time=1436166000 (July 6th)

Buyer after: http://backpack.tf/profiles/76561198108562502?time=1436252400 (July 7th)

Compare link: http://backpack.tf/profiles/76561198108562502?time=1436166000&compare=1436252400

• Mini on bubbling slick cut:

  http://backpack.tf/vote/id/55a66ac2ba8d88dd1a8b46e7

• Mini on scorching hard counter:

  Sold for max's head = 24 keys

  
  

  Seller before: http://backpack.tf/profiles/76561198123977468?time=1432969200 (May 30th)

  Seller after: http://backpack.tf/profiles/76561198123977468?time=1433142000 (June 1st)

  Compare link: http://backpack.tf/profiles/76561198123977468?time=1432969200&compare=1433142000

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Sale 3

Sold for duped green energy brain bucket and 2 keys = (27 * 0.9) + 2 = 26 keys

http://www.tf2outpost.com/trade/25934602

Seller before: http://backpack.tf/profiles/76561198069588414?time=1432278000 (May 22nd)

Seller after: http://backpack.tf/profiles/76561198069588414?time=1432364400 (May 23rd)

Compare link: http://backpack.tf/profiles/76561198069588414?time=1432278000&compare=1432364400

• Mini on duped ge brain bucket:

  Sold/offered with ~2.5 key sweets for c9 company man (29-30) = 29.5 - 2.5 = 27 keys

  
  

  Seller before: http://backpack.tf/profiles/76561197994020659?time=1431673200 (May 15th)

  Seller after: http://backpack.tf/profiles/76561197994020659?time=1432105200 (May 20th)

  Compare link: http://backpack.tf/profiles/76561197994020659?time=1431673200&compare=1432105200

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Sale 4

Sold for 25 keys

Seller before: http://backpack.tf/profiles/76561197997600533?time=1430722800 (May 4th)

Seller after: http://backpack.tf/profiles/76561197997600533?time=1430895600 (May 6th)

Compare link: http://backpack.tf/profiles/76561197997600533?time=1430895600&compare=1430722800

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Sellers:

http://www.tf2outpost.com/trade/24413149 33 keys, 6 months

http://www.tf2outpost.com/trade/26375810 30 keys, 1 week

http://www.tf2outpost.com/trade/26415333 30 keys, 6 days

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Sales at 25, 26, and 35. Given that there's a clean one on outpost unsold at 33 for 6 months, I'm going to discount the sale at 35 as an outlier and go with 25-26 keys for the range. Feedback welcome.