The previous suggestion sales are a month outdated, so this should be fine

Sale 1

http://www.tf2outpost.com/trade/27183023 Sold with a key in items for CV Belgian + Twatt Toy + Strike BaL http://imgur.com/wD8Js0l

B/O for Secret was 120

B/O for CV was 75

B/O for BaL was 35

X + 1 = 28*0.9 + 21.5*0.9 + 54*0.9

X = 92

Secret http://backpack.tf/item/2062258887

BaL http://backpack.tf/item/2774744767

CV http://backpack.tf/item/3167744783

Toy http://backpack.tf/item/2389610078 (He confirmed this was added)

Sale 2

Sold for Ghosts Hazmat + 6.4 keys of sweets ~130

Was used to price the hazmat even though it was labelled an outlier, ignoring for safety reasons