Marketplace.tf sales:

https://marketplace.tf/items/tf2/30767;5;u7

Sale #1: $16.00 / $2.00 (https://manic.tf/keyprice/?at=2020-07-04) = 8 keys

Sale #2: $16.00 / $1.98 (https://manic.tf/keyprice/?at=2020-07-07) = ~8 keys

Sale #3: $14.30 / $1.99 (https://manic.tf/keyprice/?at=2020-07-11) = 7.19 ~ 7 keys

Unknown b/o and item history for all MP sales.

Item tracing:

Item 1: https://backpack.tf/item/9084310306

Sale #4: Bought for 6.77 ~ 6.75 keys

https://gyazo.com/0662aff016d1527aab8cfff3f1359bff

Compare link didn't match:

https://backpack.tf/profiles/76561198055852136#!/compare/1597190400/1597449600

https://backpack.tf/profiles/76561198053911511#!/compare/1597363200/1597449600

Sale #5: Sold for 7.51 ~ 7.5 keys

https://gyazo.com/58b94cac111ad70254daee67a8c1f17f

Compare link not available yet.

Item 2: https://backpack.tf/item/9044285272

Sale #6: untraced

https://backpack.tf/profiles/76561198311498888#!/compare/1596931200/1597017600

https://backpack.tf/profiles/76561199057562924#!/compare/1596931200/1597017600

Sale #7: bulk/untraced

https://backpack.tf/profiles/76561199057562924#!/compare/1597017600/1597104000

https://backpack.tf/profiles/76561198808070411#!/compare/1596931200/1597104000

Sale #8: bulk/untraced

https://backpack.tf/profiles/76561198808070411#!/compare/1597104000/1597190400

https://backpack.tf/profiles/76561198269337198#!/compare/1597017600/1597104000

Sale #9 - #14: untraced, occured on the same day

Sale #15: untraced

https://backpack.tf/profiles/76561198969122505#!/compare/1597190400/1597276800

https://backpack.tf/profiles/76561198337734785#!/compare/1597190400/1597276800

Item 3: https://backpack.tf/item/4904997747

Sale #16: untraced

https://backpack.tf/profiles/76561198341171690#!/compare/1594252800/1594339200

https://backpack.tf/profiles/76561198314114548#!/compare/1593561600/1594339200

Item 4: https://backpack.tf/item/8898653995

Sale #17: SCM

https://backpack.tf/profiles/76561198040186479#!/compare/1592524800/1592611200

https://backpack.tf/profiles/76561198076569769#!/compare/1592956800/1594252800

Item 5: https://backpack.tf/item/4806106589

Sale #18: untraced

https://backpack.tf/profiles/76561198051839545#!/compare/1591228800/1591315200

https://backpack.tf/profiles/76561198238622326#!/compare/1590192000/1598227200

Item 6: https://backpack.tf/item/5046769156

Sale #19: traced 6 keys + 25 ref ~ 6.5 keys

https://backpack.tf/profiles/76561198341171690#!/compare/1593129600/1593216000

https://backpack.tf/profiles/76561198121744206#!/compare/1593129600/1593388800

Sale #20: traced 5 keys + 10 ref ~ 5 keys

https://backpack.tf/profiles/76561198121744206#!/compare/1593993600/1594166400

https://backpack.tf/profiles/76561198053252981#!/compare/1593993600/1594166400

Sale #21: untraced

https://backpack.tf/profiles/76561198053252981#!/compare/1594252800/1594339200

https://backpack.tf/profiles/76561198413362894#!/compare/1594166400/1594425600

Item 7: https://backpack.tf/item/8280150583

Skipping ScrapTF sale

Sale #22: traced 7 keys + 20 ref ~ 7.5 keys

https://backpack.tf/profiles/76561198162778875#!/compare/1591747200/1591833600

https://backpack.tf/profiles/76561198305805404#!/compare/1591747200/1591833600

Sale #22: untraced (ID not matched)

https://backpack.tf/profiles/76561198305805404#!/compare/1591833600/1592006400

https://backpack.tf/profiles/76561198080179568#!/compare/1591833600/1592006400

Sale #23: untraced

https://backpack.tf/profiles/76561198080179568#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198865732437#!/compare/1592352000/1592438400

Sale #24: untraced

https://backpack.tf/profiles/76561198865732437#!/compare/1592611200/1592784000

https://backpack.tf/profiles/76561198126526929#!/compare/1592611200/1592784000

Sale #25: traced 6 keys + 32 ref ~ 6.75 keys

https://backpack.tf/profiles/76561198126526929#!/compare/1592697600/1592956800 (missing)

https://backpack.tf/profiles/76561198394484957#!/compare/1591056000/1592784000

Sale #26: untraced

https://backpack.tf/profiles/76561198394484957#!/compare/1593129600/1593388800

https://backpack.tf/profiles/76561198149848574#!/compare/1572220800/1596499200

Sale #27: untraced

https://backpack.tf/profiles/76561198149848574#!/compare/1596758400/1597017600

https://backpack.tf/profiles/76561199043177646#!/compare/1596931200/1597017600

Item 8: https://backpack.tf/item/5856452215

Skipping transfer between accounts (Quicksell.store bot)

Sale #28: untraced (broken date)

https://backpack.tf/profiles/76561198850274253#!/compare/1595376000/1595462400

https://backpack.tf/profiles/76561198195886117#!/compare/1596931200/1598313600

Sale #29: untraced

https://backpack.tf/profiles/76561198195886117#!/compare/1596931200/1598313600

https://backpack.tf/profiles/76561198844188707#!/compare/1596931200/1597017600

-----------------------------------

Current listings: https://gyazo.com/164aed7237e0c64ebc2aa94d49857e38

Selling lowest 7.51 keys

Buying highest 6.87 keys

3 seller on marketplace.tf:

2 @ $19.79 / ~$1.85 = 10.7 keys

1 @ $21.00 / ~$1.85 = 11.35 keys

Valid sales: 8, 8, 7, 6.75, 7.5, 6.5, 5, 7.5, 6.75 keys

Excluding 5, 6.5, 6.75 keys since lower than current buying

Taking 7 - 8 keys