Using last 2 months.

Sale 1:

Sold for 15 keys

Seller: https://backpack.tf/profiles/76561198340634356#!/compare/1587945600/1588032000

Buyer: https://backpack.tf/profiles/76561198106191411#!/compare/1587340800/1588118400

https://backpack.tf/item/7892937401

https://i.imgur.com/Z1G0wkg.png - bot.tf confirms

15 keys

Sale 2:

Sold for 10 keys

Seller: https://backpack.tf/profiles/76561198353309101#!/compare/1588636800/1588723200

Buyer: https://backpack.tf/profiles/76561198101915413#!/compare/1588550400/1588636800

https://backpack.tf/item/7245846190

10 keys

Marketplace Sales:

https://marketplace.tf/items/tf2/1196;5;u3001

$23.02, April 4th

$23.02, April 5th

$25, April 27th

https://backpack.tf/item/7256566718 - 4th April

http://manic.tf/keyprice?at=2020-04-04&price=23.02 - $23.02 / $1.72 = 13.38 keys

https://i.imgur.com/Z1G0wkg.png - B/O of ~13 for one they sold 4 days prior

http://manic.tf/keyprice?at=2020-04-05&price=23.02 - $23.02 / $1.69 = 13.62 keys

http://manic.tf/keyprice?at=2020-04-27&price=25 - $25 / $1.82 = 13.74 keys

After rounding, we have:

13 keys (Capped by B/O)

14 keys (2x)

Other Sales:

https://backpack.tf/item/7316344167 (#1)

https://backpack.tf/item/7819330874 - mannco bot

https://backpack.tf/item/8244265128 - missing a person in the history

https://i.imgur.com/Z1G0wkg.png - labelled as ~13 keys

#1

Untraceable

https://backpack.tf/profiles/76561198142375270#!/compare/1586649600/1587081600

https://backpack.tf/profiles/76561198340634356#!/compare/1586995200/1587081600

https://i.imgur.com/Z1G0wkg.png - labelled as 10 keys + 16 ref

#2

Bulk for pure?

https://backpack.tf/profiles/76561198197292179#!/compare/1588291200/1588377600

https://backpack.tf/profiles/76561198353309101#!/compare/1588291200/1588377600

Looks like everything may have sold individually, but it’ll be difficult and not worth my time trying to determine exactly how much it sold for.

Sellers:

https://i.imgur.com/ATrc0R1.png

https://backpack.tf/item/7316344167 - 15 keys

https://backpack.tf/item/7483558405 - ~17.75 keys

https://backpack.tf/item/7604301288 - 20 keys

https://backpack.tf/item/7265794525 - 38 keys

Sales at:

10

13

14 (2x)

15

10 is an outlier, and is below buyers. Excluding 10.

Taking 13-15.