Yes, you can tell the difference in taste and tenderness.
But, as the guys pointed out, you have to know the pack date or kill date (some beef processors list the kill date instead of the pack date) before you can safely wet age.
I wet age briskets for at least 30 days beyond the pack date and prefer to go 45 - 50 days.
The refrigerator that you use for aging the brisket should be opened as little as possible.
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