I wasn't sure about using a SCM sale, but now it remains 1/1, so there we go

Bought on 24th December for 125.84 euros (https://imgur.com/a/jo83WU5)

Key price was going up and down these days, so i've made and avg key value from the week (3 before and 3 after) :

https://steamcommunity.com/market/listings/440/Mann%20Co.%20Supply%20Crate%20Key

21th > 1.82 +

22th > 1.79 +

23th > 1.78 +

24th > 1.81 +

25th > 1.88 +

26th > 1.91 +

27th > 1.93 = 12.92/7 = 1.8457 > 1.85

So 125.84 / 1.85 = 68.02 > 68

Using 68 keys

Not reselling