https://bot.tf/stats/listings/4ZKXXEZJ

https://backpack.tf/profiles/76561198002757046#!/compare/1563235200/1563321600

https://backpack.tf/profiles/76561198241622178#!/compare/1563235200/1563321600

Most likely 40 keys based on buyout and many keys removing+entering backpacks

https://backpack.tf/profiles/76561198057725524#!/compare/1566864000/1566950400

https://backpack.tf/profiles/76561198037171335#!/compare/1566777600/1566950400

Bulk

https://backpack.tf/profiles/76561198002757046#!/compare/1561680000/1561766400

https://backpack.tf/profiles/76561198415525729#!/compare/1561680000/1561766400

https://backpack.tf/profiles/76561198064822359#!/compare/1561680000/1561766400

Likely a bulk quicksale, looking at the second compare link with many keys & refineds

https://backpack.tf/profiles/76561198060828964#!/compare/1564185600/1564272000

https://backpack.tf/profiles/76561198043991016#!/compare/1564272000/1564358400

Untraceable or bulk quicksell, no buyouts were found that day

https://backpack.tf/profiles/76561198317061799#!/compare/1563753600/1563926400

https://backpack.tf/profiles/76561198043991016#!/compare/1563840000/1563926400

40 keys

https://bot.tf/stats/listings/MLRG3N68

//

Sellers:

https://marketplace.tf/items/tf2/1115;5;u3022

https://backpack.tf/item/6158016026 - In and out of Marketplace for a while, currently residing at $85.00 / ~47 keys

https://backpack.tf/item/5423089574 - In and out of Marketplace for a while, very high price untouched