Only sale I can find, went to a collector

[No OP Trade] Sold for C. Heart Bootleg Base Metal Billycock + Aces Rack

X = 2.9*0.9 + 2.2*0.9

X = 4.6

Rack http://backpack.tf/item/2174722199

Billycock http://backpack.tf/item/2796078718

Mirror http://backpack.tf/item/3121538886

Mini for Rack

http://www.tf2outpost.com/trade/23819416 Sold for Stormy Sack + MN Necessities

Presumed Rack was offered due to no OP Trade

X = 13 keys + 2

X = 0.9 + 2

X = 2.9

Bear http://backpack.tf/item/2637518434

Sack http://backpack.tf/item/629378437

Rack http://backpack.tf/item/2174722199

Mini on Billycock

No recent sales, using 2.2 (not too outdated, was updated when sale was about)