MaxQ, thanks for starting this thread so I can get the info I needed.
My flank has a slaughter date/production date on the package along with a use by. I didn't look at the one I already opened for tonights dinner, the empty wrapper is sealed in a garbage bag already. I was happy to see all that info on the package. I will have to look at the one I put in the freezer yesterday. Next time I get the flank in the Cryo I will keep it in the fridge according to all the info above.
I am gonna check out the brisket later and keep it in the fridge no longer than 30 days after slaughter date (hope it has one.)