STAR_

http://backpack.tf/item/5205924119

Sale 1) Sold + ~12 Keys of Stranges (not the Outback, Ambassador, or Reindoonicorn) for a Burning Flames Full Metal Drill Hat (100 Keys)

http://backpack.tf/profiles/76561198197492182#!/compare/1480032000/1480118400

High outlier.

Sale 2) Sold for a Killstreak Field-Tested Hot Spark of Life Medi Gun

http://backpack.tf/profiles/76561198127565155#!/compare/1480896000/1481500800 - Buyer's Backpack

This sale would best be used to price the Medi Gun.

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http://backpack.tf/item/5239293724

Sale 3) Sold for 43 Keys + Sulphurous Berliner's Bucket Helm ~2 Keys of Metal + ~1 Key of Items

http://backpack.tf/profiles/76561197963500354#!/compare/1479254400/1479340800 - Seller's Backpack

http://backpack.tf/profiles/76561198129234515#!/compare/1479254400/1479340800 - Buyer's Backpack

Fits in the range.

38 of the Keys were quicksold for the Steaming TC you see in the Seller's Backpack

http://backpack.tf/profiles/76561198053172418#!/compare/1479168000/1479340800 - TC Seller

Sale 4) Sold for a Power Surge Salty Dog + 134 Refined

http://backpack.tf/profiles/76561198129234515#!/compare/1481155200/1481241600

http://www.tf2outpost.com/trade/28613174 - Capped by the Buyout of 80 Keys

Salty Dog Mini

http://backpack.tf/profiles/76561198086948995#!/compare/1479340800/1479427200 - Duped KaW Rifleman + Ether Smokey + ~2 Keys of Items

http://backpack.tf/profiles/76561198152914833#!/compare/1480464000/1480550400 - Sold + ~8 Keys of Items for a Tesla Casemaker (125 Keys)

Sale 5) Sold + Professional Killstreak Australium Tomislav (18 Keys) + 5 Keys for an Aces High Antlers (87.5 Keys)

http://backpack.tf/profiles/76561198040489983#!/compare/1481328000/1481414400 - Seller's Backpack

http://backpack.tf/profiles/76561198054422117#!/compare/1481328000/1481414400 - Buyer's Backpack

87.5 - 18 - 5 = 64.5 Keys, which rounds to 65 Keys

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http://backpack.tf/item/5248031772

Sale 6) Sold for a Duped Circling Hearts Dr's Dapper Topper

http://backpack.tf/profiles/76561198087506650#!/compare/1486080000/1486166400 - Buyer's Backpack

No Mini available.

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http://backpack.tf/item/5258264104

Sale 7) Sold for a Terror-Watt Coldsnap Cap + 12 Keys

http://backpack.tf/profiles/76561198049624748#!/compare/1481587200/1482451200

Low outlier.

Sale 8) Sold for a Cloud 9 Cotton Head (60 Keys)

http://backpack.tf/profiles/76561198028768475#!/compare/1483401600/1484006400

Cotton Head Mini

http://backpack.tf/profiles/76561198028768475#!/compare/1484438400/1484784000 - Sold for a Roboactive Detective Noir (60 Keys)

Sale 9) Sold for a Stare From Beyond Human Cannonball

http://backpack.tf/profiles/76561198150783829#!/compare/1483660800/1483747200

http://www.tf2outpost.com/trade/28700114 - Capped by the Buyout of 80 Keys

Sales at: 88, ~65, 80, 65, ~50, 60, 80

Calling 50 low and 88 high.