According to the MC Claren report (2011-2015) at least 8 Russian volleyball players (men and women) tested positive and nothing happened. In the final of the Olympic qualifiers 2016, Russia beat France by 3-2 and Alexander Markin tested positive (he whas the best player in that match) and France had to play another qualifier while Russia didn´t receive any punishment, they qualified to Rio 2016.
So if you think Brasil is going to be penalized, keep waiting, this is not an individual sport and Fivb always washes its hands.