Have you somehow confirmed the suspicious votes were all done by absentee ballots?
If not, you're wrong about no "evidence" of fraud. Dead people voting after their date of death, people with the same info including the last 4 digits of their SS and even those with different digits are all evidence. It may not be conclusive evidence, but it is evidence.
In the absence of voter ID conclusive evidence is difficult, if not impossible, to obtain. It will merely be written off as clerical error.
It may interest you to know that it seems one can register to vote in NC under a false SS#:
http://www.ncsbe.gov/ncsbe/Portals/0/FilesP/NCVRRegFormv102013eng.pdf
The above documents can be used in lieu of a state issued ID (DL) and proof of SS# is not required, just name and address.
Hence, the fact that the last 4 digits don't match for those cases may not be of any importance since it's easy to circumvent.
However, if an ID is required, and the clerk checks it closely, the false SS# will be discovered.
Edit: It's amusing that liberals can figure out how HFT's can subvert a complicated electronic stock trading system but can't seem to accept that a shoddy voting system can also be subverted.
Fern