The brisket was right out of a very cold fridge prior to prepping it. Smelled fine and was cryovaced from Costco. No sign of further puffing after rebagging. I’m not too concerned. I ground up some of the trimmings for a very rich ~60/40 burger yesterday and today. No symptoms of a problem. Yesterday’s was a decent thick burger. Felt a bit too fatty. Today’s was a very thin pressed patty. just right with good crisp browning
I have done fridge aging of briskets in cryo in the past, like weeks without incidence. This one was two days.