Let me show you a magic trick.

also dupe = clean yay

Sold for 74 Keys

http://backpack.tf/profiles/76561198043004059/#!/compare/1454054400/1454140800

http://www.tf2outpost.com/trade/27681290

Sold with ~2 Keys in Sweets for a Miami Nights Executioner(37.5 Keys) and a Max's Severed Head(29.5 Keys)(65 Keys total)

http://backpack.tf/profiles/76561198110035148/#!/compare/1454832000/1454918400

http://backpack.tf/profiles/76561198112612121/#!/compare/1454832000/1454918400

Sold for 70 Keys(Item IDs match)

http://backpack.tf/profiles/76561198043569380/#!/compare/1456646400/1456819200

DUPED SALES

Sold for 35 Keys and a Disco Beat Down Scotsman's Stovepipe(27.5 Keys, rounding to 28)(63 Keys total)

http://backpack.tf/profiles/76561198113627840/#!/compare/1454832000/1455004800

Sold for 27 Keys, a Terror-Watt Crocleather Slouch(~17 Keys), a Miami Nights Professional's Panama(~15 Keys), an Australium Stickybomb Launcher(17.5 Keys at the time, rounding to 18) and ~9 Keys in Sweets(B/O was 70)

http://backpack.tf/profiles/76561198065132511/#!/compare/1456041600/1456473600

http://www.tf2outpost.com/trade/27855421

Sold for a Burning Flames Scotsman's Stovepipe(77 Keys)

http://backpack.tf/profiles/76561198011811223/#!/compare/1456732800/1456905600

Sold for 71 Keys

http://backpack.tf/profiles/76561198053252981/#!/compare/1459814400/1459900800

Sold for a Cloud 9 Spec KS Executioner and a Haunted Ghosts Scotsman's Stovepipe(80+?)

http://backpack.tf/profiles/76561198076020691/#!/compare/1458630000/1458716400

Leaving this as supportive to the 77 key sale, probably an outlier after minis.

Sales seem to fit, 63-77 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.