Odds of winning prizes and legal obligation

[Toad]

In my country, it is a legal requirement to publish the statistical odds of winning prizes in contests. Where is this information published for WoT "loot boxes" and "draws"?

[Schnabeltier]

check the info-button of the loot box. that will show you a list of all possible items with it's odds.
(as a general rule you can assume, that the "good stuff" (like the tank(s) ) are far below 1%. so, with 99%+ you'll recieve some "junk" stuff like grey or blue boosters)

edit: if you are talking about that new boxes like that smasher box... well, i personally would always assume to get the tank (main prices) at the last two draws. yes, it could be earlier, but those happend always to other people, not to me.
it's just another box with a tank and some adds for 15500 gold.