Swarm cells vary in age. You might find one with a egg in it, but that doesn't mean there isn't one that is capped and they swarmed yesterday...
In my case the QC's are in a split Nuc. But I would think one or 100 may indicate a swarm in the making, though some are just doing away with the old lady.:shhhh:One of my takeaways from other threads was that, if you only find 6 or less (plus or minus a couple) queen cells, they're likely to be supercedure and not swarm cells. This thread seems to say that even if you only find one queen cell, it's probably a swarm cell. What gives?