I bet any good powder coater could match it exactly. There are computers that read colors to get an exact match.
The fellas at the Duron Paint store in my area need some of these computers. These guys can't match sh*t. I have made 4 trips this week with a sample swatch of the paint I needed. WTF?
OP- From my experience FOX uses a somewhat flat black powdercoat and should be fairly easy to match. I have had great success with a local powdercoat shop in matching a brown from Transition Bikes. Have you tried to ask locally yet?
"We can always find excuses if we want to find them, but if we really want to do something, we have to just go."
Typically black sheens are graded in percentage of gloss, i.e a 40% gloss is flatter than a 60%. Sheens typically range from a flat (~0-20%), to an eggshell (~30-40%), to satin (~40-60%), to semi-gloss (70-80%), to gloss (~90-100%). All of those sheens are typically offered by most powder coaters. If you can estimate the %age that Fox uses, you should be able to get close enough that the separation between your rear triangle and the fork will not allow you to notice a difference.