The 500 number came from Donnie and Holly Faulkner when info about the pair (and the Five 3.0) came out. They ran the Rolling O back in the day, and the Fire Scelzi R2 was exclusive to them for a bit, so the info is good.
But this is Oakley.
An employee has a certain level of knowledge, but the company is so big and multi-national that one employee may not have full knowledge of everything. I have no doubt that there are more than 500 Fire Scelzi R2s out there.
With Oakley, unless the marketing specifies a certain number or the product has a serial number, word-of-mouth production figures tend to be inaccurate. Even if they do have a serial number or number-of-production tied to it, Oakley doesn't always adhere to it. Examples: The original re-issue of the Frogskin back in 2007 had the Polished Clear/Violet Iridium Frogskins being limited to 3,000, but then it was later re-re-released again as regular production (albeit with a new SKU); The Police Pack was suppose to be limited to 500 but there are packs out there with a serial of over 500.