Sale 1

Sold with ~1 key sweets (rounding) for orbiting planets front runner = 15 - 1 = 14 keys

Seller before: http://backpack.tf/profiles/76561198094780965?time=1423814400 (February 13th)

Seller after: http://backpack.tf/profiles/76561198094780965?time=1423900800 (February 14th)

• Mini on orb planets front runner:

  Sold for 15 keys

  
  

  Seller before: http://backpack.tf/profiles/76561198094730000?time=1427958000 (April 2nd)

  Seller after: http://backpack.tf/profiles/76561198094730000?time=1428217200 (April 5th)

Sale 2

Sold for bubbling sergeant's drill hat = 15 * 0.9 = 14 keys

Buyer before: http://backpack.tf/profiles/76561198119216883?time=1431241200 (May 10th)

Buyer after: http://backpack.tf/profiles/76561198119216883?time=1431414000 (May 12th)

• Mini on bubbling drill hat:

  Sold for aces heavy duty rag (11-12) and summer shades (3) = 15 keys

  
  

  Seller before: http://backpack.tf/profiles/76561198041364161?time=1430550000 (May 2nd)

  Seller after: http://backpack.tf/profiles/76561198041364161?time=1430809200 (May 5th)

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Other sales in the histories are complex, involving multiple low-tiers for higher tier hats so not using them. Feedback welcome.

Edit: Just realised that first sale is slightly outdated now, but same value anyway so just call it support proof if ya want.