thanks torb and shuffle.

sale 1: involved in a sale for duped sunbeams tc

https://backpack.tf/profiles/76561198192740165#!/compare/1552608000/1552694400

sale 2: sold for sunbeams deep cover operator + earbuds + 7 keys + strange professional killstreak frying pan

https://backpack.tf/profiles/76561198013633449#!/compare/1557100800/1557360000

170 + 2.85 + 7 + 21 = 200.85 rounding to 200 keys

mini on operator -unsold at 170

https://gyazo.com/7ab69d8a05f11e29479892abce78f746

mini on pan

https://marketplace.tf/items/264;11;kt-3

on may 6 one sold for 34.51 and on may 9 one sold for 41.57

taking the average of the two prices which would be 38.04

as for keys, the average price on may 8 is 1.8.

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

38.04 / 1.8 = 21.13 rounding to 21 keys

making final price of 200 keys.