Resuggestion, thanks to K1ng for the info!

Christmas Event 2019!

Team 5 is Alive!

Sale 1:

https://backpack.tf/profiles/76561198431725617#!/compare/1571875200/1571961600

https://backpack.tf/profiles/76561198116597185#!/compare/1571788800/1571875200

6 keys 40 refs

Sale 2:

https://marketplace.tf/items/tf2/181;5;u36

https://backpack.tf/item/1392926512

Mp.tf $15.99 / $1.81 = 8.83 keys

Sale 3:

https://backpack.tf/profiles/76561198067714525#!/compare/1569628800/1569715200

https://backpack.tf/profiles/76561198323565601#!/compare/1569542400/1569628800

QS

poorly bumped unsold for ~7.5 keys,

taking the range, conserves around unsold.

K1ng's Part:

Sale 1 actually rounds up to 7:

https://bot.tf/stats/listings/4W603WO5 ----- keys were around 51.66 at the time

looks like the seller sold as well:

https://backpack.tf/profiles/76561198116597185#!/compare/1577059200/1577145600

Yeah, 7-7.5 should be fine. Marketplace sellers are at $12.59, which is below sale 2.