Resuggestion, thanks to Mindacos & Giggity for the info!

Sale 1:

https://backpack.tf/profiles/76561198354656940#!/compare/1565481600/1565568000

https://backpack.tf/profiles/76561198025618418#!/compare/1565481600/1565740800

SCM

Sale 2:

https://backpack.tf/profiles/76561198129380689#!/compare/1568505600/1569110400

https://backpack.tf/profiles/76561198973894950#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561198089253101#!/compare/1568419200/1568505600

Gambling?

Sale 3:

https://backpack.tf/profiles/76561198089253101#!/compare/1569196800/1569283200

https://backpack.tf/profiles/76561198317374063#!/compare/1569196800/1569283200

Gambling

Sale 4:

https://backpack.tf/profiles/76561198218384043#!/compare/1563667200/1564185600

https://backpack.tf/profiles/76561198830746068#!/compare/1563580800/1563667200

QS

Sale 5:

https://backpack.tf/profiles/76561198094370379#!/compare/1565481600/1565913600

https://backpack.tf/profiles/76561198021055079#!/compare/1565827200/1565913600

Sold for 14 keys

Sale 6:

https://backpack.tf/profiles/76561198059628254#!/compare/1567036800/1567123200

https://backpack.tf/profiles/76561198333986358#!/compare/1567036800/1567123200

Bulk QS(?)

Sale 7:

https://backpack.tf/profiles/76561198333986358#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198101623903#!/compare/1568937600/1569024000

Sold for 15 keys

Sale 8:

https://backpack.tf/profiles/76561198063803737#!/compare/1567123200/1567123200

https://backpack.tf/profiles/76561198308147530#!/compare/1566432000/1567209600

https://backpack.tf/profiles/76561198146430672#!/compare/1517011200/1567209600

Gambling

Sale 9:

https://backpack.tf/profiles/76561198050814838#!/compare/1569456000/1569542400

https://backpack.tf/profiles/76561198080179568#!/compare/1569456000/1569542400

QS

Sale 10:

https://backpack.tf/profiles/76561198212634325#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198337734785#!/compare/1565827200/1565913600

QS

Sale 11:

https://backpack.tf/profiles/76561198337734785#!/compare/1568332800/1568419200

https://backpack.tf/profiles/76561198387794743#!/compare/1561766400/1569369600

Keys

Sale 12:

https://backpack.tf/profiles/76561198093120331#!/compare/1564790400/1571443200

https://backpack.tf/profiles/76561198004496214#!/compare/1566172800/1568851200

Untrace

Sale 13:

https://backpack.tf/profiles/76561198065749444#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198051504085#!/compare/1567209600/1567296000

Can trace ~5.5 keys

Sale 14:

https://backpack.tf/profiles/76561198051504085#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198134902030#!/compare/1567209600/1567296000

Sold with negligible sweets for KaW Tossle

use there

Sale 15:

https://backpack.tf/profiles/76561198134902030#!/compare/1568332800/1568419200

https://backpack.tf/profiles/76561198407129701#!/compare/1568332800/1568419200

Sold for ~14 keys in sweets

Sale 16:

https://backpack.tf/profiles/76561198407129701#!/compare/1569110400/1569196800

https://backpack.tf/profiles/76561198126727161#!/compare/1569196800/1569283200

Sold for 18 keys

Sale 17:

https://marketplace.tf/items/tf2/980;5;u61

$21.84 / $1.82 = 12.00 keys

https://backpack.tf/item/7956583962

Total sales @:

12, 14, 14, 15, 18 keys

Buyers up to 9 keys,

unsold for 2 weeks at 16 keys,

https://bot.tf/stats/listings/Y7DGR1VW

calling 18 high,

12 low to balance,

Giggity's Part:

https://marketplace.tf/items/tf2/980;5;u61

Nov 13, not sure if this is the right history https://backpack.tf/item/2884545897 - No b/o.

https://backpack.tf/profiles/76561198444717492#!/compare/1572998400/1573430400

https://backpack.tf/profiles/76561198986177898#!/compare/1572912000/1572998400

https://bot.tf/stats/item?def=980&q=5&ef=Miami%20Nights&craft=1&aus=0&ks=0&source=browser_script

https://bot.tf/stats/listings/425KP707

quick sold to a bot.

Also, seller at 13 keys for more than a week - https://gyazo.com/d91d98796311a2afb0147a0f70266b43

Mindacos' Part:

Yeeeah, the 13 Key seller needs to be accounted for.

I don't think 12 can be called low anymore, so 12-15 should be the range to go with.