Brisket freezing question...

Ok, so I think I may have goofed on this one. I smoked a few brisket flats for my son's wedding a week or so ago. I didn't carve one of them up because I also smoked some pulled pork and a few other people brought some dishes. Mistake on my part because the brisket was devoured. Anyway when I got home I was to tired to do anything so I just vacuum sealed the 8 pound(not sliced) flat and tossed it into the freezer. My question is can I thaw it out use it for a couple different dishes and then refreeze without hurting the quality, or do I need to use it up?

Chris