I bought a whole prime packer brisket last Thursday at Costco in anticipation of my first born coming out of the NICU last Friday and me being off all this week. Long story short, he got delayed until this weekend (hopefully) and I'll be off next week. Its been in the fridge ever since. My mom's old school thinking says I need to freeze it because the sell by date was 10/3. It's not been opened, its still in the cryo bag sealed. Am I ok to let it ride until I cook it sometime in the next 7-10 days?