Hey, more sales. Chiroptera is still better.

http://backpack.tf/item/2032723661

Sale 1) Sold + Mega Strike I See You for a Scorching Flame Detective Noir (76 Keys)

http://backpack.tf/profiles/76561198039260384#!/compare/1477526400/1477612800

Low Outlier.

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Sale 2) Sold for a Death at Dusk Wet Works + Professional Killstreak Australium Frontier Justice (~11 Keys) + Professional Killstreak Batsaber (~10 Keys)

http://backpack.tf/profiles/76561198320991962#!/compare/1477612800/1477699200 - Seller's Backpack

http://backpack.tf/profiles/76561198107249245#!/compare/1477612800/1477699200 - Buyer's Backpack

Fits in the range as a median value, roughly.

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Sale 3) Sold for a Circling Hearts Private Eye (49 Keys) + Circling Hearts Lord Cockswain's Pith Helmet (37.5 Keys) + 1 Key

http://backpack.tf/profiles/76561198069658143#!/compare/1478131200/1478217600

49 + 37.5 + 1 = 87.5, which rounds to 88 Keys

Private Eye Mini

http://backpack.tf/profiles/76561198055358018#!/compare/1475539200/1475625600 ~49 Keys

http://backpack.tf/profiles/76561198069527288#!/compare/1475366400/1475452800 - 49 Keys

Credits to polar for both sales here.

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Sale 4) Sold + 7 Keys for a Chiroptera Venenata Liquidator's Lid (50 Keys) + Stormy Storm Trophy Belt + Steaming Scotsman's Stove Pipe

http://backpack.tf/profiles/76561198055847835#!/compare/1479254400/1479340800

This should fit in the range, as I doubt the Trophy and Pipe are less than 33 Keys combined.

Liquidator's Mini

http://backpack.tf/suggestion/5836071f8667475ac440bd82 - Using the 50 Key sale.

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Sale 5) Sold for a Stormy 13th Hour Virtual Reality Headset (70 Keys) + Professional Killstreak Australium Blutsauger (~9 Keys)

http://backpack.tf/profiles/76561198243616070#!/compare/1480032000/1480118400

70 + 9 = 79 Keys

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Sale 6) Sold + Steaming Hustler's Hallmark + Negligible Sweets for a Green Confetti Villain's Veil (65 Keys)

http://imgur.com/a/CCR

http://backpack.tf/profiles/76561198108628484#!/compare/1480118400/1480204800 - Buyer's Backpack

http://backpack.tf/profiles/76561198171447086#!/compare/1480118400/1480204800 - Seller's Backpack

Low Outlier

Veil Mini

http://backpack.tf/profiles/76561198075816743#!/compare/1477180800/1477353600 - Sold for 65 Keys