“I don’t have the original files anywhere else since the drive they were stored on was erased. Shouldn’t I be able to reopen a LT or Motion file from the browser in FCP?”
This is your issue. LT and Motion both work in a way that is a little different than you might think. When you save a project in either program you can essentially drag the “project” into FCP and that “project” then acts like a clip. You have to think of the original project as media like you would a Photoshop file or a a video clip. If the original file doesn’t exist anymore FCP doesn’t “remember” what was contained in the file hence the media offline message you are getting. FCP will not open either file becasue to FCP that file no longer exists.
To avoid this in the future you can do several things.
1. Always save the original LT or Motion Project File as well as a copy of the elements you may have used in those projects. You don’t need to save the elements that come with the apps (as you can always re-installl thes) but you do need to save any alternate elements like Photoshop docs or created background video that you are using in the projects. I always save a folder for each project that contains the LT or Motion project as well as any elements so that I can always bring these projects back to life.
2. Export your project to QT or whatever video flavor you want to use. I would suggest, of course, the highest quality possible so that you always have at the very least a clip that should be usable for you.
Unfortunatly I think you are out of luck in getting this media back as the original files have been erased. Unless you can find these files you are back to the creation stage. Sorry for the bad news but change your workflow a little and you won’t run into the issue again.
Hope it helps.
Bob