I have on a number of occasions found unexpected larvae developing in cells
placed in a swarm box.  I've always suspected that they were cases of
thelytoky--the case in which a female worker can lay a fertilized egg.  This
process has been scientifically documented in colonies of Apis mellifera (by
genetic analysis), and is common in some clones of Apis capensis.

Such an occurrence would appear to be the result of workers transferring
eggs or larvae.  I also would like to see some actual observational reports
of the physical transfer of eggs or larvae.

Randy Oliver
Grass Valley, CA
ScientificBeekeeping.com

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