The safest way to proceed is to start over with a clean hive box. The fact that bees came in and died off (more likely than left), means the mites probably got them, but there is a possibility mean something else nastier is there, like foul brood, which infects the box.

Take the frames with honey and put them in trash can bags, and tie them tightly so no air can get in, and put them in a freezer overnight. This is to kill any wax moth eggs that are there. Hatched out, wax moths cause an incredible mess. Take them out of the freezer and let them come to room temperature before you open the bag. The bag treatment is to keep them from becoming damp from condensation (corrections welcome from others here).

I'll let another beekeeper tell you whether to use the honey for another hive.

Better Bee can tell you exactly what you need.