Sale 1:

https://marketplace.tf/items/tf2/30001;5;u59

$29.99 / $1.82 = 16.48 keys

Sale 2:

bulk

https://backpack.tf/profiles/76561198086070401#!/compare/1555718400/1555804800

https://backpack.tf/profiles/76561198062611321#!/compare/1555632000/1555804800

Sale 3:

untrace

https://backpack.tf/profiles/76561198163335046#!/compare/1557792000/1561075200

https://backpack.tf/profiles/76561198021419893#!/compare/1558224000/1560556800

Sale 4:

using on airdog

https://backpack.tf/profiles/76561198142755528#!/compare/1553731200/1553817600

https://backpack.tf/profiles/76561198014962768#!/compare/1552867200/1553990400

Sale 5:

this sale was used to price the bonk helm: https://backpack.tf/suggestion/5cdd703ad381726c431fcff5

https://backpack.tf/profiles/76561198127718182#!/compare/1553385600/1553904000

https://backpack.tf/profiles/76561198142755528#!/compare/1553817600/1553904000

Sale 6:

Sold for PE bombing run

With buyers on boming run at 18 keys+ and almost month unsold at 17 on pile: https://gyazo.com/91189bba3e044d9ea4428de09229ca54

Excluding ^^^

https://backpack.tf/profiles/76561198127718182#!/compare/1556236800/1556582400

Sale 7:

Excluding due to buyer at 14: https://imgur.com/a/DMJYUVK

14 pure

https://backpack.tf/profiles/76561198334367671#!/compare/1556496000/1556582400

https://backpack.tf/profiles/76561198002757046#!/compare/1556496000/1556582400

Sale 8:

15 pure

https://backpack.tf/profiles/76561198002757046#!/compare/1556582400/1556668800

https://backpack.tf/profiles/76561198007563498#!/compare/1556582400/1556668800

Sale 9:

untrace

https://backpack.tf/profiles/76561198007563498#!/compare/1556668800/1556928000

==============================================================================

Sales:

15,16