I did a quick people search on RM and it included these places where he might have lived:
Huntington Station, NY (we know it is his present address)
Old Bethpage, NY (he grew up there)
Hicksville, NY
Warwick, RI
This list may not be accurate, because these search sites are often full of errors, but if most or all of them are true, could he have gone back to any of these places? The Warwick, RI location looks very interesting to me. It is in my neck of the woods. I know the area very well. i grew up near there. Could he have connections there?? He could have easily taken a train to that location. Long Island RR to Amtrak then the MBTA train or bus.