Look at me, I'm the Peacebreaker now.

https://steamcommunity.com/market/listings/440/Strange%20Peacebreaker

Dividing by the average price of a key on that day.

7 sold on May 2nd, 2020:

$7.50/$2.25 = 3.3 keys

https://marketplace.tf/items/tf2/31044;11

Dividing by the average price of a key on that day.

5 sold on March 1st:

$5.12/$1.73 = 2.96 keys ~ 3 keys

$5.20/$1.73 = 3 keys

$5.21/$1.73 = 3 keys

$5.23/$1.73 = 3.02 ~ 3.05 keys

$5.23/$1.73 = 3.02 ~ 3.05 keys

1 sold on March 2nd:

$9.79/$1.71 = 5.7 keys

https://bot.tf/stats/item?def=31044&q=11&ef=&craft=1&aus=0&ks=0

https://imgur.com/a/UujzHhL

Sale:

1 @ 2 keys

Outliers: 5.7 keys and 2 keys.

Taking 3 - 3.3 keys as the range.