Usually jabuticaba seeds are very resistant, after this period they should reach their destination almost germinated.
About customs of Brazil, you are lucky, most of the packages are actually being held and returned.
Friday I received pagodas with myrtacea seeds that I sent in March and all arrived with my hand sprouted.
I suggest you plant the seeds and draw the water as it can ferment.
as I said by the photos it has everything to be jabuticaba Sabará, but anyway, nothing better than the response of those who posted the seeds.
I have asked the sender to try and ask around if it is this one. BTW, as soon as I received the seeds, I have soaked them in water. They were in transit for about 20 days and arrived dried up. I change the water thrice daily. It's the second day now. Still the water turns brown. Any reason for that? Also, will these germinate?
Maybe Sabará, Jaboticaba comum.