Thx Jarool (The PFetti Killer) for the extra sales :D

Sale #1 - Silver Cyclone Scorcher + 1 key

https://backpack.tf/profiles/76561198332009528#!/compare/1551312000/1551484800

https://backpack.tf/profiles/76561198158607141#!/compare/1551312000/1551398400

Sale #2 - 9 keys 22.88 ref

https://backpack.tf/profiles/76561198158607141#!/compare/1552003200/1552089600

https://backpack.tf/profiles/76561198361129578#!/compare/1552003200/1552089600

Sale #3 - Untrace

https://backpack.tf/profiles/76561198000730178#!/compare/1547683200/1547769600

https://backpack.tf/profiles/76561198035169922#!/compare/1546300800/1547769600

-- (new sales)

Sale #4 - bulk for searing eyewear

https://backpack.tf/profiles/76561198862468027#!/compare/1554076800/1554163200

https://backpack.tf/profiles/76561198261268231#!/compare/1554076800/1554163200

https://backpack.tf/item/7573691209

Sale #5 - sold to a quickbuyer for 8 keys + 2 ref

https://backpack.tf/profiles/76561198261268231#!/compare/1554076800/1554163200

https://backpack.tf/profiles/76561198085931736#!/compare/1553558400/1554163200

https://backpack.tf/item/7616815878

Sale #6 - untraceable

https://backpack.tf/profiles/76561198361129578#!/compare/1552780800/1552867200

https://backpack.tf/profiles/76561198311873180#!/compare/1552780800/1552867200

https://backpack.tf/item/7573691209

Sale #7 - sold for 9 keys

https://backpack.tf/profiles/76561198311873180#!/compare/1552780800/1552867200

https://backpack.tf/profiles/76561198012217876#!/compare/1552780800/1552867200

https://backpack.tf/item/7573691209

Sale #8 - sold for 9 keys + 5 ref

https://backpack.tf/profiles/76561198012217876#!/compare/1552780800/1552867200

https://backpack.tf/profiles/76561198048851745#!/compare/1552780800/1552867200

https://backpack.tf/item/7573691209

Sale #9 - untraceable

https://backpack.tf/profiles/76561198049628131#!/compare/1553385600/1554076800

https://backpack.tf/profiles/76561198341171690#!/compare/1553644800/1553731200

https://backpack.tf/item/7409077311

"given the new sales and the seller at ~9.2, i reckon you'd be fine going with 9-9.5"

Taking 9 - 9.5 keys as Jarool recommends