Run your hive tool across the cappings to expose the honey underneath.
If it's runny, not so that it's dripping everywhere. Just 'bruise' it.
Depends what's above your BB as well as what's in your BB.
If sealed stores of sugar syrup and undrawn foundation above, then bruising would be good, but if you have stores of sugar syrup and a drawn super on top, then they will just move the sugar (or any other udesirable store e.g ivy) into your honey crop.
If it is undesirable stores, then it is best to get rid of it, by uncapping it and either scraping or forking it out. So long as they have adequate stores for themselves in the BB still.
Just one of my methods and opinions. There are others.