Ok, I figured out the root cause of why the images did not come across, and it had to do with the original server move. The files were uploaded in ASCII instead of Binary, so they were corrupted and not recognized as images. I have corrected the original issue and re-imported them. That said, I have a bit more work to do so the posts with the attachments start looking like they should. So the good news is they will be fixed, but it might take me a bit.
Jason