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If you're going to re-heat in an oven, here's a suggestion to keep the meat moist:
fill a jelly pan (aka cookie sheet) with just a little bit of water, and place the brisket (wrapped in foil, cracked open) in the jelly pan and cook at the temps suggested, above. The water will create a "steam" that will help keep the meat from drying out as it re-heats.