Here is a link I found to assist with how to tell if a company is in fact a certified rspo member, I have been trying to find a supplier for palm wax, and so far no one is showing up. Even if a company is selling for an rspo member, they are supposed to be a member as well in order to claim rspo status.
https://www.palmoilinvestigations.org/poi-blog/how-to-check-if-a-brand-are-using-certified-palm-oil