3 Years? Impossible!

Bot.tf: https://bot.tf/stats/item?def=288&q=6&ef=&craft=1&aus=0&ks=0 | https://imgur.com/a/MjLGRnk

General Sales:

Sale 1:

https://backpack.tf/item/562448873

Sold for 5 Keys

https://backpack.tf/profiles/76561198047573393#!/compare/1566345600/1566518400

https://backpack.tf/profiles/76561198839295161#!/compare/1566345600/1566518400

Sale 2:

https://backpack.tf/item/559834446

Untraceable

https://backpack.tf/profiles/76561198937966869#!/compare/1566172800/1566777600

https://backpack.tf/profiles/76561198256468268#!/compare/1567123200/1567209600

Sale 3:

https://backpack.tf/item/557986541

Untraceable

https://backpack.tf/profiles/76561198235240668#!/compare/1563667200/1563840000

https://backpack.tf/profiles/76561198953224119#!/compare/1564012800/1565654400

Marketplace Sales:

Sale 4:

Sold on Aug 31st for $0.28, Keys were $1.82

0.2 Keys

Sale 5:

Sold on Aug 25th for $3, Keys were $1.82

1.6 Keys

Sale 6-7:

Sold on Aug 23th for $3 x2, Keys were $1.82

1.6 Keys x2

Sale 8:

Sold on Aug 9th for $4, Keys were $1.83

2 Keys

Sale 9:

Sold on Aug 1st for $0.86, Keys were $1.8

0.5 Keys

Sale 10:

Sold on Jul 9th for $2.69, Keys were $1.84

1.5 Keys

Sale 8:

Sold on Jul 7th for $2.69, Keys were $1.83

1.5 Keys

Summary of Sales:

1x 5

1x 2

3x 1.6

2x 1.5

1x 0.5

1x 0.2

Considering 0.2, 0.5, 2, & 5 outliers,

Going with 1.5-1.6 Keys