Sale 1:

Sold for Mega Strike Victory Lap (10.25) + 11 keys

Seller: https://backpack.tf/profiles/76561198095022965#!/compare/1590624000/1590710400

Buyer: https://backpack.tf/profiles/76561198150013695#!/compare/1590624000/1590710400

https://backpack.tf/item/7425439179

https://bot.tf/stats/listings/466K8EO2 - B/O of 22

21 keys

Sale 2:

Sold for 18 keys

Seller: https://backpack.tf/profiles/76561198335791307#!/compare/1592697600/1592784000

Buyer: https://backpack.tf/profiles/76561198205455311#!/compare/1592697600/1592784000

https://backpack.tf/item/7425439179

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

18 keys

Marketplace Sales:

https://marketplace.tf/items/tf2/1172;5;u3026

$37.23, May 14th

$20, June 3rd

$36.26, July 2nd

$36.26, July 25th

$37.99, July 27th

https://backpack.tf/item/5207192013 - Either the 25th or 27th

http://manic.tf/keyprice?at=2020-05-14&price=37.23 - $37.23 / $1.90 = 19.59 keys

https://bot.tf/stats/listings/MXXV37X7 - No important B/O

http://manic.tf/keyprice?at=2020-06-03&price=20 - $20 / $1.96 = 10.20 keys

Went to a buy order, no point checking snapshots.

https://backpack.tf/item/5192957621

http://manic.tf/keyprice?at=2020-07-02&price=36.26 - $36.26 / $2.01 = 18.04 keys

https://bot.tf/stats/listings/4P0JKO30 - July 2nd

http://manic.tf/keyprice?at=2020-07-25&price=36.26 - $36.26 / $1.93 = 18.79 keys

https://bot.tf/stats/listings/429XLDRZ - No important B/O

http://manic.tf/keyprice?at=2020-07-27&price=37.99 - $37.99 / $1.92 = 19.79 keys

https://bot.tf/stats/listings/4WXO0E3N - No important B/O

Couldn’t find the remaining histories.

After rounding, we have:

20 keys (2x)

Other Sales:

https://backpack.tf/item/8198245891 (#1)

https://backpack.tf/item/7425439179 (#2)

https://backpack.tf/item/6176613279 (#3)

#1

Transferred between alts/friends or something

https://backpack.tf/profiles/76561198341726034#!/compare/1594425600/1596758400

https://backpack.tf/profiles/76561198970055782#!/compare/1584230400/1596672000

#2

Sold with Cyclone Deep Fried Desire for Grail Victory Lap

https://backpack.tf/profiles/76561198150013695#!/compare/1590796800/1590883200

https://backpack.tf/profiles/76561198335791307#!/compare/1590710400/1590796800

Better off being used on the Grail.

#3

Transferred between alts/friends or something

https://backpack.tf/profiles/76561198119675339#!/compare/1592092800/1594252800

https://backpack.tf/profiles/76561198155203796#!/compare/1582416000/1594252800

Sales at:

10

18 (2x)

19

20 (2x)

21

10 is an outlier, excluding 10.

Taking 18-21.