1 in 56 million chance for this to happen! I unlocked Amber!(Read description) -Brawl Stars
Chance to get legendary was 0.1771% or 0.1771/100
Chance for Star power was 1% or 1/100
Mega boxes are equivalent to 10 brawl boxes
I got 2 star power so 1/100 x 1/100 x 0.1771/100 x 10
1/56,500,000 approximately
Tier 50 of free brawl pass btw