An extensive Google search only turned up the fact that NC5083 is c/n 494. Hopefully that will get you a step nearer tracing its subsequent history?
http://aerofiles.com/regs-5000.html
http://aerofiles.com/alex-regs.html
http://aerofiles.com/_alex.html
Still, I learned a lot about Alexander Eaglerocks from the search, a fascinating subject for someone like me brought up on a diet of Moths, Percivals and Miles .
I wonder how many are still flying?
I could find 20 on the USCAR, c/n 494 not being among them.
http://registry.faa.gov/aircraftinquiry ... ndfind.y=0
http://registry.faa.gov/aircraftinquiry ... xt=0400500
http://registry.faa.gov/aircraftinquiry ... rtxt=427AE
N5083 is now a Grumman Ag-Cat. It was registered in 1973, so NC5083 must have lost this registration then or before.
Hope this helps.