It sold for a strange metal modest and the sellers aren't strange, so it'll be worth more. Furthermore except under exceptional circumstances sellers are not valid minis on unpriced items anyway. You need to actually evaluate that second sale.

http://backpack.tf/item/5191469123

http://backpack.tf/profiles/76561198203978028#!/compare/1488326400/1488412800

Sold for Stormy Noir + G.Fetti Capotain (Both are in-date but Capotain has two sellers at 12)

= 35.

http://backpack.tf/profiles/76561198208062409#!/compare/1492560000/1492732800

Sold for TWatt DCO (55) + S. Pro KS Shooting Star (~15)

= 70, probably too high.

http://backpack.tf/profiles/76561198054047907#!/compare/1491350400/1491523200

Added ~13.5 in mostly pure for MG Capotain (31.5) + OF RoboStovepipe (~12)

= 30.

Taking 30-35, rounding to 33.

26-33 would be better here.