Rust inside of hatchback?

I have noticed that whenever I open up the hatchback of my hornet, I can hear what I assume are rust flakes moving around. There's no clear exterior rust anywhere, so i'm guessing that moisture got inside and started to rust from the inside out. Assuming I could get most of it out through the latch hole with a decent amount of effort, is there any recommended way to slow down the rusting process without major surgery? 

The moisture got there because your window seal has failed. You should have a glass person re-seal that window, or very soon you will have rust holes in the hatch.

Ended up getting the rear window resealed a few days ago, and when it came out I was surprised to see that there was no rust to be found. Good news, but then I guess water was coming in from somewhere else. 

[QUOTE=phast1] Ended up getting the rear window resealed a few days ago, and when it came out I was surprised to see that there was no rust to be found. Good news, but then I guess water was coming in from somewhere else.  [/QUOT

Not sure where you expected to find rust, but the window seal is still the most likely source of the leak. What I would do would be to use a skinny wand or tube to spray some rust converter in the 'weep' holes in the bottom of the hatch and anywhere else you can get some inside access....maybe remove the 'pin' near the latch, or the lock cylinder and spray away.