If you have a good freezer that keeps them frozen and if they're vacuum sealed, they should be good pretty much at least a year IMO...however if they're just packed in ziploc bags, they can get freezer burn just like any other meat in your freezer...and I'd say 6 months is pushing it...Thaw one of em out and if it smells worse than a more recent one/is falling apart(or more mushy than usual), toss em.
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