(edit)
One of the 'successful' queen cells gave me an odd situation. I think she was not mated well, but the nuc accepted her as a good queen. There were never any new eggs from her! I gave that nuc a brood frame from another colony, but both times all brood from those frames grew to maturity and I never saw any fresh eggs or larvae, even looking with a magnifier. There was no sign of a laying worker, no eggs at all. The funny thing is, the entire time, this nuc behaved as if it had a laying queen. They clustered around her, built comb, and stored honey and pollen just like a normal colony.
Even more (?) odd is what you describe recently came across my radar, from a client's woes.
Rare enough to warrant record I have posted my account here;
http://wwwdotbiobeesdotcom/viewtopic.php?t=19371(note: the link will not set in raw mode - join the dots to go live)
What I took away from the exercise is to be astute/observant with which
virgins mated one selects. Maybe even go the longer route in banking mated queens - over
selection and "squishing". Like if they are laying in the comb cage they get the gig.. if not,
wellll your call. The stressing worked for me without too much devil in the detail.
On topic: my planning for 2018 from 2017 is to be packaging cut comb by the carton in April/May
from my LLTBH. This to finance my all-terrain electric wheelchair in managing the bees ;-)
Bill