Sale 1:

https://backpack.tf/profiles/76561198217741760#!/compare/1563494400/1563753600

https://backpack.tf/profiles/76561198080179568#!/compare/1563408000/1563494400

Keys, QS to bot

Sale 2:

https://backpack.tf/profiles/76561198873670820#!/compare/1559606400/1559779200

https://backpack.tf/profiles/76561198873586080#!/compare/1559433600/1559606400

bulk

Sale 3:

https://backpack.tf/profiles/76561198000263169#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198106795971#!/compare/1561939200/1562025600

Keys (Count)

Sale 4:

https://backpack.tf/profiles/76561198106795971#!/compare/1561939200/1562025600

https://backpack.tf/profiles/76561198337982050#!/compare/1561939200/1562025600

Sold for OF Bonnet + MW Battin(2.75) + 4 keys

Bonnet Mini:

https://backpack.tf/suggestion/5d5f52556780722ab34111f4

Suggestion for 12 keys

Total is ~17 keys

Sale 5:

https://backpack.tf/profiles/76561198337982050#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198082205267#!/compare/1561766400/1562112000

Sold with ~1 key in sweets for OF Baker

Baker Mini:

https://backpack.tf/suggestion/5d5f473dd381723a0f16bc63

Suggestion for 13 keys

Total is 12 keys

Sale 6:

https://backpack.tf/profiles/76561198082205267#!/compare/1562112000/1562198400

https://backpack.tf/profiles/76561198339336870#!/compare/1562112000/1562198400

Sold with ~1 key in sweets for Steaming Headsplitter(14.5)

Total is 13.5 keys

Sale 7:

https://backpack.tf/profiles/76561198339336870#!/compare/1563235200/1563321600

https://backpack.tf/profiles/76561198867626964#!/compare/1562457600/1563321600

Sold for Atomic Trans(15) + negligible sweets

Sale 8:

https://backpack.tf/profiles/76561198867626964#!/compare/1562457600/1563321600

https://backpack.tf/profiles/76561198415180580#!/compare/1563148800/1563321600

Sold for 8 keys (used to buy OF Cyborg) + ~3 keys in sweets

Total is 11 keys

Sale 9:

https://backpack.tf/profiles/76561198415180580#!/compare/1563321600/1563408000

https://backpack.tf/profiles/76561198130439466#!/compare/1563321600/1563408000

Sold for 12 keys

Sale 10,11:

https://marketplace.tf/items/tf2/30862;5;u6

$26.99 / $1.84 = 14.67 keys

$29.99 / $1.80 = 16.66 keys

Total sales @:

11, 12, 12, 13.5, 14.67, 15, 16.66, 17 keys

unsold at 16 for ~3 weeks,

taking 11 - 15 keys.