The important point is "from as much ebay parts as possible" because I suspect there are still "jeep in a crate" boxes where all you have to do is remove the Cosmolene (this is undoubtedly not all you have to do btw)
On a slightly newer time scale there are always firearm collectors searching for something impossible to acquire now, but which might have been acquired at some point in the past and squirreled away in its factory original box in the cosmoline. Like somebody who might have purchased an imported Egyptian Maadi AKM (locally made AK47 variant) in 1982, then never unpacked it for whatever reason. People collect these thi…
15 years or so ago when I was more into guns I spent a _lot_ of time on historical firearm sites looking for Martini-Henry rifles. There were still a trickle of them turning up straight from caches in Afghanistan (maybe other countries too). I never bought any because I was just a teenager, and now prices have more than doubled, of course.