From what I know, these are the best copies of Warring States beads coming out of Java at the moment.
Interesting, but not convincing.

I visited the Shanghai museum when they had an exhibit on Warring States beads. I took pictures of all the beads and the digital presentation they had. If you like a PDF of these pictures, let me know. It is a large file, that I can send to your email with Wetransfer.