Sale 1

Sold for dbd wraith wrap (38-43), miami galvanized gibus (72-82) and pro aussie rocket launcher (67-78) = (40.5 + 77 + 73) * 0.9 = 171 keys

Sellers bp before: http://backpack.tf/profiles/76561198120366659?time=1422172800 (January 25th)

Sellers bp after: http://backpack.tf/profiles/76561198120366659?time=1422259200 (January 26th)

Sale 2

Sold for scorching bonk helm (56-59), something burning this way comes hottie's hoodie (55), haunted ghosts seargent's drill hat (36-46) and ~3 keys in sweets = (57.5 + 55 + 41 + 3) * 0.9 = 141 keys

Sellers bp before: http://backpack.tf/profiles/76561198110037051?time=1421827200 (January 21st)

Sellers bp after: http://backpack.tf/profiles/76561198110037051?time=1421913600 (January 22nd)

Sale 3

http://www.tf2outpost.com/trade/25335689

Sold for c9 armoured authority (37), molten mallard ground control (47) and $150 paypal (150/1.80 = 83 keys) = (37 + 47) * 0.9 +83 = 159 keys

Sellers bp before: http://backpack.tf/profiles/76561198091854314?time=1426748400 (March 19th)

Sellers bp after: http://backpack.tf/profiles/76561198091854314?time=1426834800 (March 20th)

Sale 4

Sold for demonflame bubble pipe (160-180) = 170 * 0.9 = 153 keys

Sellers bp before: http://backpack.tf/profiles/76561198101210182?time=1423728000 (February 12th)

Sellers bp after: http://backpack.tf/profiles/76561198101210182?time=1423814400 (February 13th)

Mini for pro aussie rocket launcher:

Average price buyer pays ~$180

Average seller receives ~$153

Scm key price ~$2.30

180/2.30 = 78 keys

153/2.30 = 67 keys

Range = 67-78 keys

Mini for c9 armored authority:

Sold for nuts n bolts villains veil (40-42) = 41 * 0.9 = 37 keys

http://www.tf2outpost.com/trade/25456527

These are the most recent sales I could make sense of. Any feedback/additional info is appreciated. Thanks for comments on range, included all says and rounded it.