According to my alternate sources, a couple of people in the US DoD and also a arms inspector in Belgium, it is just another set of mis-identifiers...Like the T-74 tank.

It also does not help that the russian Defense system seems to be trying very hard to disassociate themselves from any idea of failure now that they seem to be more in need of good defense sales.
Anyhow, the BRDM-3 may also just be a company moniker, or it may only be a prototype. I have heard it is in low-sereis production, but that does not mean it is true, especially since there is very little info onthe web about it.
However, there are many US systems not on the web as well...systems not intended for foreign sale.