The FDA says 5 to 10 days which I think is a big stretch. Since you don't know how long they've been on ice in the warehouse. I would use them within two days. Freezing them is a big DO NOT.
No tag? They should be labeled as to when they were harvested. They should be good as long as they stay closed. Keep them on ice and use them within two days to be safe.
Once or twice in the past decade, I let it go until the next day (as inpatskitchen refers to), but that's not a winning proposition. The shellfish isn't getting any better and you will have lower yields due to more dead mussels which should be discarded. That means you get less for the same amount of money the longer you don't cook them.
Cooked mussels can last several days in the fridge.
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Once or twice in the past decade, I let it go until the next day (as inpatskitchen refers to), but that's not a winning proposition. The shellfish isn't getting any better and you will have lower yields due to more dead mussels which should be discarded. That means you get less for the same amount of money the longer you don't cook them.
Cooked mussels can last several days in the fridge.
Good luck.