New stuff has to have "USBC*" as part of the serial number if it's approved (to make it easier to distinguish the three non-approved balls from the 25000 approved ones). There was a clause about stuff without the logo being illegal after, I think 1/1/08, but I don't think it went into effect.
It was a part of the CG-within-1"-of-grip-center stuff that was defeated. Those rules specified that current equipment with an x-hole or the CG too far from grip center would be illegal after 1/1/08, but I believe all the "dated" sections were removed.
SH