What
Traffic_Is_Er_Was said is correct.
If a pilot reported unsure of position or experiencing VMC or other difficulties OCTA within radar coverage, Flight Service would,
as a matter of routine, coordinate with the relevant overlying ATC sector - often transferring the aircraft to the ATC frequency - and ATC then providing assistance with position identification, heading to fly etc. etc.
From the many earlier threads on MDX, the pilot didn't report experiencing navigation or other difficulties, so FS and ATC were unaware.
New MDX - Five Dead Williamtown Never Found