Resuggestion, thanks to K1ng for the info!

Sale 1:

https://backpack.tf/profiles/76561198301326229#!/compare/1562371200/1562457600

https://backpack.tf/profiles/76561197967157205#!/compare/1561248000/1565395200

Untrace

sale 2:

https://backpack.tf/profiles/76561198213674613#!/compare/1561766400/1561939200

https://backpack.tf/profiles/76561198163031219#!/compare/1561766400/1561939200

Sold for Bubbling Gatsby + 3 keys

Gatsby Mini:

https://backpack.tf/suggestion/5d8bc746d3817220f0672092

Suggestion for 9.5 keys'

Total is 12.5 keys

https://bot.tf/stats/listings/MG6Z8R74

B/O of 12 keys, capping

Sale 3:

https://backpack.tf/profiles/76561198358482558#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198406460966#!/compare/1566777600/1566864000

Sold for ~12 keys

Sale 4:

https://backpack.tf/profiles/76561198406460966#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198420511241#!/compare/1567123200/1567209600

Sold for TW Mmph

use there

Sale 5:

https://backpack.tf/profiles/76561198420511241#!/compare/1568419200/1569024000

https://backpack.tf/profiles/76561198150917840#!/compare/1568592000/1568764800

Sold for ~10 keys

sale 6:

https://backpack.tf/profiles/76561198150917840#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561198325595749#!/compare/1568764800/1568851200

Bulk

sale 7:

https://backpack.tf/profiles/76561198325595749#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561198089253101#!/compare/1568764800/1568851200

Sold for 9 keys

sale 8:

https://marketplace.tf/items/tf2/31024;5;u61

$28.26 / $1.83 = 15.44 keys

Total sales @:

9, 10, 12, 1215.44 keys

buyers up to 9 keys,

sellers at 12 keys

calling 9 low,

15 high,

taking 10 - 12 keys

K1ng's Part:

3 keys were added with the Gatsby in sale 2:

https://backpack.tf/item/6770794190

https://backpack.tf/item/7719655809

https://backpack.tf/item/6815267271

10-12 should be okay