Sale 1:

https://backpack.tf/profiles/76561198928421771#!/compare/1591488000/1591574400

https://backpack.tf/profiles/76561198079996881#!/compare/1591228800/1591833600

Sold for 17 keys (bot.tf confirms)

https://bot.tf/stats/item?def=30369&q=5&ef=Cloud%209&craft=1&aus=0&ks=0&source=browser_script

https://i.imgur.com/XChOrzX.jpg

sale 2:

https://backpack.tf/profiles/76561198162647421#!/compare/1591488000/1591660800

https://backpack.tf/profiles/76561198097499917#!/compare/1591488000/1591574400

Bulk

sale 3:

https://backpack.tf/profiles/76561198097499917#!/compare/1591833600/1592006400

https://backpack.tf/profiles/76561198809614738#!/compare/1591920000/1592006400

Sold for Smoking Hot Dogger(12.5)

sale 4:

https://backpack.tf/profiles/76561198809614738#!/compare/1592179200/1592438400

https://backpack.tf/profiles/76561197961663268#!/compare/1592438400/1592697600

Sold for ~9.5 keys

sale 5:

https://marketplace.tf/items/tf2/30369;5;u58

$30.99 / $1.94 = 15.97 keys <--- https://backpack.tf/item/7956018256

$30.99 / $1.94 = 15.97 keys <--- https://backpack.tf/item/7957266361

$34.99 / $1.93 = 18.13 keys

$30.99 / $1.87 = 16.57 keys

Total sales @:

9.5, 13, 16, 16, 17, 17, 18 keys

new seller at 16 keys,

https://i.imgur.com/ymrlBTT.jpg

buyers up to ~9.5 keys,

considering 13 resold for lower (QS),

calling 9.5 low,

18 high...

let's take 13 - 17 keys...