Thanks for the quick reply.
1- I have the OLD library on a flash drive and named it "BOB", which is different from the NEW library name.
2- I can sort the NEW library by FORMAT so that I can identify all those books without something in that column.
3- If I move all those books into another library called "NO FORMAT" library, can Calibre then look at each book in the "NO FORMAT" library folder and pick that matching book out of the "BOB" library (from the flash drive) and copy it over, so the process can be automated. I really don't want to try to find 600 bad formatted books by hand, item by item. Any thoughts?
If not, then I would have to create/Switch <path to the BOB library on the flash drive. Select the books: Right click: Copy to NEW library.
HOW TO GET ADDITIONAL HELP:
Is there any way we can contact Kovid Goyal and ask him for his input? That would really help us tremendously!