https://marketplace.tf/items/tf2/30977;5;u121

July 14 - $89.99 = 49 keys

August 23 - $89.00 = 49 keys

September 1 - $105 = 58 keys

https://backpack.tf/item/7258263815

Quicksold on either July 5 or 10, then most likely later sold for one of the Marketplace sales

https://backpack.tf/item/7286034393 Most likely the August 23 sale

https://backpack.tf/profiles/76561198251380626#!/compare/1564358400/1564617600

https://backpack.tf/profiles/76561198078559370#!/compare/1563926400/1564444800

Untraceable, the first compare link's compares don't even go back far enough

https://backpack.tf/profiles/76561198078559370#!/compare/1563667200/1563926400

https://backpack.tf/profiles/76561198040965000#!/compare/1563753600/1564012800

48 keys

Unsure if any of these were Marketplace sellers, but buyouts of 50 keys https://gyazo.com/31222ec941dcee89dd0665bc568a8afe

https://gyazo.com/ffecc91ad103d88f424924c9a11a5474

https://gyazo.com/662c17e43ad977f03da7e6f368700ce0

https://gyazo.com/d82632e4e315d011436a6aaf3fcb240c

All 50 key buyouts

Going with 48-50 keys