Not really answering your question but, in case it helps:
.br's have a very weird drop schedule which have made me stop going after them in the past.
At that time (and I think it is still valid now) if two or more different entities were after the same domain then the drop time got delayed until the next window opening where, if the same thing happened, it moved to the next opening..etc. etc.
Why I'm telling you this? because it's hard for a BO service to keep up with that.
What you can do is monitor the domain via whois and if you don't see any of the so-called 'tickets' showing then you are probably in luck as it will become free in the next drop-time (I think it happens once / month now).
At least that was the case a few months back when I stopped paying attention to any .br domains.
Hope you catch the domain you are after!