Speaking of eBay and kris (Moro), books and handling are the best ways to tell authenticity. I never buy anything I haven't researched. This means that I pass up things sometimes, but then again, I have only been burned once.
Also, this helps in what to look for, say, when the pictures are bad. If you look at my avatar picture, the blade is WWII, but the hilt that you see is older and made of silver, swaasa (gold, copper, silver mix), and ivory. I got this puppy on eBay several years ago for.....dirt (less than $400 and I don't plan on selling it
). No one else bid on it because the pictures were aweful. However, I could tell enough about the metal work and ivory to be the only one to bid and won!
Again, research helped me out on this to see beyond the terrible picture (and the dealer was honest).