I'm aware of using the MOC to store unreleased vehicles. I used it myself back when the Hunter wasn't released until many weeks later.Info for all vehicles was already available here. The “Tunable Blacklist” you added is blatantly not true,or easily avoidable, we’ve been storing unreleased vehicles for quite some time.
However, storing said vehicles in a normal garage will swap them out with empty slots (afaik).
I'm also aware of the "Downloadable Content Missing" notif, but iirc, that has been gone for quite some time.
But if you know more than me about this, feel free to share, and I'll update the thread.
After reading your comment again, I fail to understand two things;
Information about blacklisted vehicles is already on this Forum - Where? Because I have personally never seen anyone ever mention a full list of blacklisted cars. Sure, you might use common sense to know you can't store a Dump Truck, but back when I needed a list of all the blacklisted vehicles, I couldn't get it. Now that I do, I share it with everyone here, because someone might find it useful.
"WE've" been storing unreleased vehicles for some time - Who? You, your friends group or literally everyone else on this forum? Once again, I have not seen a single thread explaning how to store unreleased vehicles.
I'm more than open to hear more about how all of this works, as I only speak from personal experience and hints I get from the scripts.