Jack,
I don’t know anything about this type of media but I do know a little about AMA so I might be able to help you. You mentioned that the clips are named “PIX_001_001” but they are in ascending order, correct? Meaning the next clip is PIX_001_002? Also, do you have a picture of the file structure showing exactly what it looks like when you mount the drives?
Finally, I wrote a book about Avid and one of my chapters lightly touches upon AMA and on my website is a sample chapter that good for you is that particular chapter. Maybe you can check it out to see if it can help you while I do some research on my end once you reply?
Kyra