Sale 1:

https://backpack.tf/profiles/76561198098973286#!/compare/1573171200/1573344000

https://backpack.tf/profiles/76561198387892741#!/compare/1573257600/1573344000

Untrace

sale 2:

https://backpack.tf/profiles/76561198387892741#!/compare/1573344000/1573430400

https://backpack.tf/profiles/76561198171058391#!/compare/1573344000/1573430400

Untrace

sale 3:

https://backpack.tf/profiles/76561198171058391#!/compare/1573344000/1573430400

https://backpack.tf/profiles/76561198822611056#!/compare/1573430400/1573516800

Bulk

sale 4:

https://backpack.tf/profiles/76561198822611056#!/compare/1573516800/1573603200

https://backpack.tf/profiles/76561198155110999#!/compare/1573516800/1573603200

QS

sale 5:

https://backpack.tf/profiles/76561198374028945#!/compare/1566000000/1567209600

https://backpack.tf/profiles/76561198049268686#!/compare/1565913600/1566000000

Sold for spell

sale 6:

https://backpack.tf/profiles/76561198049268686#!/compare/1567036800/1567209600

https://backpack.tf/profiles/76561198841912826#!/compare/1567123200/1567209600

Untrace

Sale 7:

https://backpack.tf/profiles/76561198841912826#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198018497391#!/compare/1566950400/1567209600

Sold for Aces Robo + ~1.5 keys in sweets

Robo Mini:

https://backpack.tf/suggestion/5dcf944ad38172616a3a167a

suggestion for 7.25 keys

Total is ~8.75 keys

sale 8:

https://backpack.tf/profiles/76561198023286613#!/compare/1569542400/1569628800

https://backpack.tf/profiles/76561198831617783#!/compare/1566259200/1569801600

Untrace

sale 9:

https://backpack.tf/profiles/76561198970987097#!/compare/1570320000/1570406400

https://backpack.tf/profiles/76561198805760331#!/compare/1570320000/1570406400

untrace

sale 10:

https://backpack.tf/profiles/76561198035712034#!/compare/1559433600/1567036800

https://backpack.tf/profiles/76561198252901833#!/compare/1566086400/1573516800

Untrace

sale 11:

https://backpack.tf/profiles/76561198841912826#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198212809176#!/compare/1566259200/1567209600

Sold for N&B Hetman + negligible sweets

Hetman Mini:

https://backpack.tf/suggestion/5dcf9319d381725fbc798486

Suggestion for 7 keys

Sale 12, 13:

https://marketplace.tf/items/tf2/30057;5;u56

$15 / $1.82 = 8.24 keys <--- https://backpack.tf/item/7956417210

$14.5 / $1.82 = 7.97 keys <---- https://backpack.tf/item/7955884003

total sales @:

7, 8, 8, 8.75 keys

3 month unsold at 8 keys,

buyers at 6.29 keys,

taking 7 - 8 keys.