"67 sprite

I recently purchased a '67 sprite out of a barn where it had been sitting for
12+ years and 3 homeowners.
How do I go about tracing down the owner who left this little car behind to get
a "clear" title?  The sheetmetal is excellent on this car and I don't want to
get a "salvage" title if I can avoid it.

Also I'm new to spridgets.  What are some unique features about the '67

The ID plate show this as an M series car

Any help is appreciated