I don't think there will be a problem feeding the old honey back to the bees especially if it was sealed up. I use frame feeders for my bees, but if you don't have an interior feeder you could just leave the bucket open near the hives and they will take it. That is if the weather enables the girls to fly.
How ever you feed it. Make sure that they can get out of it. If you just put it out in a bucket, they will bee knocked into it by other bees and not bee able to get out. If they get honey on their wings that cant get it off. Lots of bees will die. Happened to me. Now when I feed back, I pour into a container and put rocks in it so they can get to it but not knocked into it by other bees.
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