A few sales on this airdog:

Sale 1:

https://backpack.tf/profiles/76561198233504112#!/compare/1548288000/1553385600

https://backpack.tf/profiles/76561198212306977#!/compare/1551225600/1551225600

Unknown = Excluding

Sale 2:

https://backpack.tf/profiles/76561198515764827#!/compare/1549670400/1549756800

https://backpack.tf/profiles/76561197972568409#!/compare/1533081600/1549756800

Unknown = Excluding

Sale 3:

https://backpack.tf/profiles/76561197972568409#!/compare/1549756800/1549843200

https://backpack.tf/profiles/76561198427292637#!/compare/1549584000/1549843200

Quicksold = Excluding

Sale 4:

https://backpack.tf/profiles/76561198337077750#!/compare/1550448000/1550534400

https://backpack.tf/profiles/76561198515764827#!/compare/1550361600/1550448000

Quicksold for 9k 4.33ref (proof for the quicksale: https://i.imgur.com/R12HSMc.png ) = Excluding

Sale 5:

https://backpack.tf/profiles/76561198515764827#!/compare/1550448000/1550966400

https://backpack.tf/profiles/76561198102384645#!/compare/1550880000/1550966400

Sold for 10k 16ref = 10 keys

Sale 6:

https://backpack.tf/profiles/76561198102384645#!/compare/1550966400/1551139200

https://backpack.tf/profiles/76561198841365001#!/compare/1551052800/1551139200

Quicksold for 9k 7ref (proof: https://bot.tf/stats/listings/4Z1R5LXY) = Excluding

Sale 7:

https://backpack.tf/profiles/76561198394903250#!/compare/1552694400/1552780800

https://backpack.tf/profiles/76561198135388328#!/compare/1552694400/1552780800

Most likely gambled = Excluding

Sale 8:

https://backpack.tf/profiles/76561198397984750#!/compare/1550448000/1550534400

https://backpack.tf/profiles/76561198050155657#!/compare/1539907200/1551916800

Unknown = Excluding

Sale 9:

https://backpack.tf/profiles/76561198397984750#!/compare/1551830400/1551916800

https://backpack.tf/profiles/76561198830125323#!/compare/1551830400/1551916800

Quicksold for 9k 4.88ref (proof for quicksale: https://bot.tf/stats/listings/MNWZN2JM ) = Excluding

Sale 10:

https://backpack.tf/profiles/76561198312816066#!/compare/1550448000/1550534400

https://backpack.tf/profiles/76561198307497830#!/compare/1550361600/1550534400

Sold for 10k pure

Sale 11:

https://marketplace.tf/items/30767;5;u60

Sold for 19.50$/1.8 = 11 keys

Taking 10-11 keys