Sale 1:

Stats from bot.tf bots -

https://bot.tf/stats/item?def=1117&q=5&ef=Mega+Strike&craft=1&aus=0&ks=0

https://gyazo.com/84b7ed6e6d15488df80a1e7d4b15e81e

Past 30 days : Sold 1 for 3 keys+30 refs

Bought 2 for 2 keys+25 refs and 2 keys+32refs

Sale 2: Marketplace.tf

26th May sold 3 for $5.44 (key price $1.81 -> 5.44/1.81=3)

27th May sold 1 for $5.46 (key price $1.81 -> 5.46/1.81=3.01 rounding to 3)

5th June sold 1 for $7.9 (key price $1.80 -> 7.9/1.80=4.3)

https://marketplace.tf/items/tf2/1117;5;u3010

------------------------

So we have

Sales :

1x 3.19 keys , 3x 3keys , 1x 3.01 keys (rounding to 3) , 1x 4.3keys (too high from the rest)

Taking 3-4 coz of the 4.3k sale.