I had to clear out so many cobwebs to the point where I forgot my own suggestion format

Sale 1

https://backpack.tf/profiles/76561198004517334#!/compare/1504656000/1504915200 Something involving EoF Little Buddy, histories are choppy, not touching

Sale 2

http://www.tf2outpost.com/trade/29332061 Sold for 16 keys + 1 key in ref + 1 key in items

X = 16 + 1 + 1

X = 18

Trade https://backpack.tf/profiles/76561198339104273#!/compare/1505001600/1505088000

Mongol https://backpack.tf/item/3365745116

Sale 3

http://www.tf2outpost.com/trade/29315532 Sold for 16 keys

B/O for Mongol was 16

X = 16

Trade https://backpack.tf/profiles/76561198062481755#!/compare/1502582400/1503014400

Mongol https://backpack.tf/item/3365745116

Rest of keys used for Smoking Bone Dome https://backpack.tf/profiles/76561198149258718#!/compare/1502928000/1503014400

Sale 4

https://backpack.tf/profiles/76561198232041512#!/compare/1506211200/1506297600 Bulk for 13th Conquistador

Sale 5

http://www.tf2outpost.com/trade/29282648 Sold for 19 keys

B/O for Mongol was 22, then changed to 17, but the trade was closed instantly. Taking 19.

X = 19

Trade https://backpack.tf/profiles/76561198263197430#!/compare/1505520000/1508457600

Mongol https://backpack.tf/item/206443124

Sale 6

https://backpack.tf/profiles/76561198050062763#!/compare/1504483200/1504569600 GE Coupe, best used to price Coupe

Sale 7

https://backpack.tf/profiles/76561198188240093#!/compare/1507766400/1507939200 Indeterminate amount of keys

Sale 8

https://backpack.tf/profiles/76561198030550493#!/compare/1504742400/1505001600 Sold with sweets for KWatt Ushanka, best used to price Ushanka

Sellers

http://www.tf2outpost.com/trade/29396373 16 keys, 1w

https://gyazo.com/65cf6d80ac94345656fc36aa9fdadc3d 1x 16k, 1x17k, 1x 18k, 2x 20k