Sale 1:

https://backpack.tf/profiles/76561198050712972#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561198169444473#!/compare/1568419200/1568505600

Bulk

sale 2:

https://backpack.tf/profiles/76561198169444473#!/compare/1568678400/1568764800

https://backpack.tf/profiles/76561198063640894#!/compare/1568678400/1568764800

Use there

sale 3:

https://backpack.tf/profiles/76561198063640894#!/compare/1568764800/1569974400

https://backpack.tf/profiles/76561198032507301#!/compare/1569801600/1569974400

Sold for P Fetti Trencher(14.5) + 3 keys

Total is 17.5 keys

sale 4:

https://backpack.tf/profiles/76561198032507301#!/compare/1570147200/1570579200

https://backpack.tf/profiles/76561198070614452#!/compare/1570492800/1570579200

Sold for 13 keys

sale 5:

https://backpack.tf/profiles/76561198106377931#!/compare/1573257600/1573344000

https://backpack.tf/profiles/76561197978488770#!/compare/1573257600/1573344000

sold for TW Bomb Beanie

Bomb Mini:

https://backpack.tf/suggestion/5dd84374d3817257b716eda0

Suggestion for 9.5 keys

https://bot.tf/stats/listings/MXQWJ1LD

B/o of 15 keys

sale 6:

https://backpack.tf/profiles/76561197978488770#!/compare/1573257600/1573344000

https://backpack.tf/profiles/76561198334946156#!/compare/1573257600/1573344000

Bulk

sale 7:

https://backpack.tf/profiles/76561198334946156#!/compare/1573344000/1573430400

https://backpack.tf/profiles/76561197994697258#!/compare/1573344000/1573430400

Bulk

sale 8:

https://marketplace.tf/items/tf2/30001;5;u33

$29.69 / $1.81 = 16.40 keys

https://backpack.tf/item/3726373958

Total sales @:

9.5, 13, 16, 17.5 keys

buyers up to 10 keys,

2 month unsold for 15 keys,

calling 9.5 low,

17.5 high,

taking 13 - 16 keys, conserving close to unsold