I don't know when they started making them, but they stopped roughly 2-3 years ago when Gibson started getting all stabby about companies making guitars or parts that looked like theirs,
especially those that did a better job than they do (not a very high bar, so read: everybody). Prior to that, Warmoth was making Les Paul, LP Jr, Flying V, SG, and L5S bodies along with appropriately headstocked necks. They differed in that they used bolt-on rather than set necks, but were otherwise pretty faithful copies, albeit with some options available Gibson wouldn't/didn't do (vibrato and other non-TOM bridges, alternate pickup routings, etc.).
Nobody's really sure what Mr. Juszkiewicz's lawyers and/or marketing weenies were thinking (if they were thinking at all) when they made that move, but it couldn't have had anything to do with increasing sales or market penetration, at least in the real world. But, anyone who was making facsimiles of any Gibson products was forced to modify their designs slightly to avoid the dreaded intellectual properlty litigation that would follow if they did not, a move that could easily kill any company that didn't have an orchard of money trees. As a result, there are fewer examples of their designs being sold in the world, so less people are seeing them, and more newer/better/different designs are gaining acceptance and nibbling away at their market share.
As for how you missed it, I couldn't say. But, examples show up on eBay every once in a while if you've got a hankering.
Incidentally, if you like the example in my sig, the build thread is
here. They were still making that body then, and that was in 2013