Thx FishCrimes for helping out

No sales via item histories

https://marketplace.tf/items/tf2/31094;5;u7

October 13: $30/1.89=15.87 keys ~16

October 19: $35/1.87=18.72 keys ~19

November 10: $25/1.78=14.04 keys ~14

December 5: $39.99/1.76=22.72 keys ~23

We have 14, 16, 19 and 23

Excluding 14 because it's for sure low looking at generic buyers at 13.4

The mean value of the sales is 18 which is closer to 16-19 so 23 can be cut off too

going 16-19