chest box tickets

some missions give me 3 tickets, some more than 3, and sometimes none. But how do we have these tickets? what are the requirements to have more? it doesn't matter if your going for xp, tomato, or deadly missions because i already went to a deadly mission that only gives me 2 tickets while i have xp missions that gives me 5 tickets.. i think it have something to do with the trait "lucky".. but im not sure.. i haven't done any experiment on that. but if someone know, please comment.. Thank you!
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