Part of what would drive me nuts, is that not every individual part, is a part.
Some parts are not parts, and are only part of an assembly. So the only way to get certain parts, is to buy the whole assembly.
I suspect that's the issue here. You're trying to get that broken plastic trim piece, and you think it's a part...but it's not a part. It's a component to an assembly, and it was never listed as a part, designed as a part, or sold as a part. It's a piece of a part, so to speak. It's part of an assembly. It never had it's own number. The only way to get that is to replace the whole box.
I'm going to hit some more junk yards locally, and try to find more parts for my Pathfinder. Heck, I might have to go into business pulling parts and listing them on ebay! lol