Hi Michael,
Welcome to the forum.
First off, I think you should remove any price tags on your kerises before you ask fellow forumnites of their opinions. It is sometimes quite amazing what a price tag can do to influence opinions.
Anyway, to your general questions of how to tell real kerises from fake kerises, I think it depends on what your definition of a 'real' and 'fake' keris is. To me, there are no 'fakes', only poorly-made ones, or well-made ones, fanciful/'touristy' ones or traditional ones.
The best way to equip yourself with the knowledge to tell the differences between kerises is to read and look at pictures. You can check up
http://www.ethnographicartbooks.com/ to search for some of these kinds of books.