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If it helps, my first LP was a 2006 Studio and it arrived, unbeknownst to me at the time, chambered. From what I researched Gibson began chambering them either in 2006 or late 2005. I lost track of ongoing changes somewhere around 2010. They have been all over the place the last 10+ years, constantly changing specs, so you really do need to take each instrument on a case-by-case basis for the most part.
Thank you both for the info. I was beginning to think the answer was so obvious that it was a dumb question! I just bought an '05 Standard, and it apparently has the 9 holes drilled in it, but no chambering. I was just curious if the Studios followed the same pattern. From what you told me, apparently they do. I was told that the Standards began chambering in late '05 or early '06, and prior to that, they were drilled out, starting in the late 70's or early '80's. I appreciate it!