Covering all SCM Sales...

No Killstreak

https://steamcommunity.com/market/listings/440/Collector%27s%20Gunslinger

https://steamcommunity.com/market/pricehistory/?appid=440&market_hash_name=Collector%27s%20Gunslinger

$195.66 / $2.31 = ~85 keys (Jun 2)

$104.82 / $2.31 = ~45 keys (Jun 3)

Basic Killstreak

https://steamcommunity.com/market/listings/440/Collector's%20Killstreak%20Gunslinger

https://steamcommunity.com/market/pricehistory/?appid=440&market_hash_name=Collector%27s%20Killstreak%20Gunslinger

Nothing recent

Specialized Killstreak

https://steamcommunity.com/market/listings/440/Collector's%20Specialized%20Killstreak%20Gunslinger

https://steamcommunity.com/market/pricehistory/?appid=440&market_hash_name=Collector%27s%20Specialized%20Killstreak%20Gunslinger

Nothing recent

Professional Killstreak

https://steamcommunity.com/market/listings/440/Collector's%20Professional%20Killstreak%20Gunslinger

https://steamcommunity.com/market/pricehistory/?appid=440&market_hash_name=Collector%27s%20Professional%20Killstreak%20Gunslinger

Nothing recent

Mp.tf

https://marketplace.tf/items/tf2/142;14;kt-2

$229.99 / $1.98 = ~116 keys (Aug 6)

Other Histories

Item 1

https://backpack.tf/item/5453043196

Sale 1

https://backpack.tf/profiles/76561198032789419#!/compare/1684108800/1684195200

https://backpack.tf/profiles/76561199223016965#!/compare/1681862400/1684195200

130 keys? - This was dumped to glad tho, I'll make a note to exclude this one

Sale 2

https://backpack.tf/profiles/76561199223016965#!/compare/1685318400/1685577600

https://backpack.tf/profiles/76561199198828064#!/compare/1685404800/1685923200

Can't load seller inv

Sale 3

Bot - - > Bot Owner

Item 2

https://backpack.tf/item/5396323081

Sale 4

https://backpack.tf/profiles/76561198097200828#!/compare/1686441600/1686614400

https://backpack.tf/profiles/76561198024867201#!/compare/1686528000/1686614400

No clue

Item 3

https://backpack.tf/item/3359869235

Sale 5

https://backpack.tf/profiles/76561199404657410#!/compare/1686182400/1686700800

https://backpack.tf/profiles/76561198805428379#!/compare/1686528000/1686700800

80 keys?

Sale 6

https://backpack.tf/profiles/76561198805428379#!/compare/1688774400/1689120000

https://backpack.tf/profiles/76561198048176208#!/compare/1688860800/1688947200

I'd wager this was a bot transfer

Item 4

https://backpack.tf/item/2967926560

Spelled, ignoring

Item 5

https://backpack.tf/item/2152446578

Sale 7

https://backpack.tf/profiles/76561198905234101#!/compare/1683676800/1683763200

https://backpack.tf/profiles/76561198107860996#!/compare/1686268800/1686787200

No clue

Item 6

https://backpack.tf/item/2096875309

Sale 8

https://backpack.tf/profiles/76561198045914603#!/compare/1684454400/1686009600

https://backpack.tf/profiles/76561198850121720#!/compare/1685404800/1685491200

Can only match an incomplete amount here

Sale 9

https://backpack.tf/profiles/76561198850121720#!/compare/1685491200/1685577600

https://backpack.tf/profiles/76561198202315432#!/compare/1684195200/1685577600

No clue

Total Sales

45, 80, 85, 116, 130

https://imgur.com/a/cFr7yaJ

130 was likely dumped for less, excluding that

80 looks to have been a buyer dump based on his listing

45 is obviously too low here

Rounding and running with 85 - 115 keys c: