Sale 1:

https://backpack.tf/profiles/76561198960625981#!/compare/1580601600/1583366400

https://backpack.tf/profiles/76561198453743732#!/compare/1583366400/1583971200

Sold with ~2 keys in sweets for N&B HWNN

use there

Sale 2:

https://backpack.tf/profiles/76561198069493147#!/compare/1581292800/1581379200

https://backpack.tf/profiles/76561198375290326#!/compare/1581120000/1581379200

Sold with negligible sweets for C9 Belgian

Belgian Mini:

https://backpack.tf/suggestion/5e9f9fce70b89846755407ae

Suggestion for 12 keys

Sale 3:

https://backpack.tf/profiles/76561198375290326#!/compare/1581379200/1581811200

https://backpack.tf/profiles/76561198907491719#!/compare/1581638400/1581811200

Sold for Aces Front runner(11) (used to buy Hermes)

Sale 4:

https://backpack.tf/profiles/76561198907491719#!/compare/1582329600/1582416000

https://backpack.tf/profiles/76561198803040574#!/compare/1582416000/1582761600

Sold for DP Burning

use there

Sale 5:

https://backpack.tf/profiles/76561198803040574#!/compare/1582416000/1582761600

https://backpack.tf/profiles/76561198077179618#!/compare/1582588800/1582761600

https://backpack.tf/profiles/76561198077870175#!/compare/1582675200/1582761600

low and bulk

Sale 6:

https://backpack.tf/profiles/76561198077870175#!/compare/1582761600/1582848000

https://backpack.tf/profiles/76561198322957656#!/compare/1582761600/1582848000

can trace sweets

Sale 7:

https://backpack.tf/profiles/76561198322957656#!/compare/1582761600/1582848000

https://backpack.tf/profiles/76561198162963055#!/compare/1582761600/1582848000

Keys or Leadwear, can't tell.

Sale 8:

https://backpack.tf/profiles/76561198162963055#!/compare/1582934400/1583020800

https://backpack.tf/profiles/76561198113194487#!/compare/1582934400/1583020800

Sold with 5 keys for C9 Combustible

combustible Mini:

https://backpack.tf/suggestion/5ead3b3ff27e0b38a8372a70

Suggestion for 14 keys

Total is 9 keys

Sale 9:

https://backpack.tf/profiles/76561198113194487#!/compare/1582934400/1583020800

https://backpack.tf/profiles/76561198042766325#!/compare/1582761600/1583020800

Sold with negligible sweets for either keys or Capotain, can't tell.

Sale 10:

https://backpack.tf/profiles/76561198042766325#!/compare/1583020800/1583107200

https://backpack.tf/profiles/76561198106650630#!/compare/1583020800/1583107200

Sold with 1 key for DBD Sultan

Sultan Mini:

https://backpack.tf/suggestion/5e9fa0b58fd55b5dc0007b5d

Suggestion for 9.5 keys

Total is 8.5 keys

Sale 11:

https://backpack.tf/profiles/76561198106650630#!/compare/1583366400/1583452800

https://backpack.tf/profiles/76561198849421013#!/compare/1583366400/1584489600

Untrace

Sale 12:

https://marketplace.tf/items/tf2/417;5;u59

$19.99 / $1.78 = 11.23 keys

Total sales @:

8.5, 9, 11, 11, 12 keys

buyers up to 7 keys,

taking 9 - 12 keys.