jimi - First thing to do is to chastise yourself for sending the wife to pick out your brisket. That's a man's job!
KIDDING ladies!!! IMO, if it's missing a good fat cap (1/4 inch is plenty for me) you can always buy some thick-sliced fatty bacon and lay it on top to replace the fat. It will also give you an added smoke flavor. Cook it as you would a normal brisket.
My $0.02 worth