Hi Fred, sorry to hear your bees didn’t make it. Any idea why?
As long as you don’t suspect a disease like AFB, you can freeze those old frames overnight to kill off pest eggs and reuse them. Start with just filling out the rest of your single brood box so they don’t have too much space to defend at first. After they’ve built up to 80% full of bees, brood and honey you can put the next brood box on with the rest of your old frames plus new ones.