It would be hard to inspect the gears without tearing the whole tranny down.
Your always going to find some small shavings in an auto tranny. I service it with new fluid and then inspect it again after 100miles or so and see what kind of shavings you have then. If they are just as big and numerous as previous, you might be looking into a rebuild.
yeah i had alot of metal shaveings on my magnet when i took mine down too i dont think its a big deal thats what the magnet is for to colect any little pieces of metal i mean it should be huge shaveings but small ones im pretty sure are ok