I don't have a 3615, but the 5335 is as follows, the 3615 by default has no permanant memory so it loses all traces of jobs on reboot:
Machine Status > Tools > System Settings > Stored File Settings > Expiration date for files stored in folder > Change Settings
Anyone know how to change how long a SecurePrint job is held before the machine will purge the job? Specially for the Xerox WorkCentre5335 & WorkCentre 3615,