How the mighty have fallen...

Sale 1:

https://backpack.tf/item/8772714599

Untraceable

https://backpack.tf/profiles/76561198144089680#!/compare/1592697600/1593302400

https://backpack.tf/profiles/76561198269337198#!/compare/1592956800/1593043200

Sale 2:

https://backpack.tf/item/7591855052

Sold for 13 Keys + CS Skins (76~ Keys) + Haunted Ghosts Tavish DeGroot Experience (48)

( https://i.imgur.com/ZkKGOrU.jpg )

( DeGroot Experience Suggestion: https://backpack.tf/suggestion/5f07e83fd538896a9f5e51d1 )

Taking 140 Keys (Rounding up from 137)

https://backpack.tf/profiles/76561198148511293#!/compare/1593993600/1594080000

https://backpack.tf/profiles/76561198127848609#!/compare/1593993600/1594080000

Sale 3:

https://backpack.tf/item/7591855052

Sold for Ghastly Ghosts Jr Hunter in Darkness (126.5 Keys)

Taking 125 Keys (Rounding down from 126.5)

https://backpack.tf/profiles/76561197980575764#!/compare/1592438400/1592956800

https://backpack.tf/profiles/76561198148511293#!/compare/1592611200/1592697600

Sale 4:

https://backpack.tf/item/7591855052

Sold for Phosphorous Front Runner (64 Keys) + Sulphurous Front Runner (N/A)

Sulphurous can't be priced, ignoring.

https://backpack.tf/profiles/76561198095022965#!/compare/1592265600/1592352000

https://backpack.tf/profiles/76561197980575764#!/compare/1592179200/1592352000

Sale 5:

https://backpack.tf/item/7591855052

Sold for 79 Keys

( https://imgur.com/YtMwcbQ )

https://backpack.tf/profiles/76561198402009056#!/compare/1588204800/1588291200

https://backpack.tf/profiles/76561198095022965#!/compare/1588204800/1588377600

Sale 6:

https://backpack.tf/item/7591855052

Sold for 122 Keys + 53 Ref

Taking 120 Keys (Rounding down from 122)

https://backpack.tf/profiles/76561198985910282#!/compare/1587513600/1587600000

https://backpack.tf/profiles/76561198402009056#!/compare/1587513600/1587600000

Thanks to Shuffle for the following sales;

Marketplace Sales

https://marketplace.tf/items/tf2/671;5;u17

Sale 7:

Sold on Jul 12th for $180 (90.91 Keys), Keys were $1.98

Taking 91 Keys

Sale 8:

Sold on Jun 22nd for $200 (101.01 Keys), Keys were $1.98

Taking 101 Keys

Going with 125-140 Keys, excluding the 79 sale as an outlier, and the 120 sale as it was dumped for 79 (credit to Shuffle)

Original Suggestion: https://backpack.tf/suggestion/5f07e8e90eb3243cd604d694