A couple uses for the already cooked packer.
Wrap in the ugly word"FOIL",paint with bbq sauce,put in 250º house oven and bring it up to at least 210º.
Let rest in a warm cooler for 2-3 hrs.
Open foil and let come closer to room temp.
You might be able to slice some,chunk some and be better than no brisket.
Yes,it will be a little "pot roasty",but a little leftover taters,gravy,and some Texas toast ain't bad.
Other thoughts would be freeze for the next cold day and cube for chili,or beef stroganoff.
Thin slice ,across the grain,soak in some homemade au jus,and makes a fine french dip/Italian beef,New Orleans Debris poorboy.
Shred the foiled packer from above and make enchiladas,tacos,burrito,tostado,etc.
Roast beef chef salad.
Cube to 3/4 inch with leftover baked potatoes and make hash.
Lots of options.