The only way to place an illustrator file into another one is to save the one you want to place with "Create PDF compatible file" clicked on. So it's not a true AI file. Plus, you cannot select more than one file at a time to place, so if you have multiple pages ranging in the 100s, this proves to be cumbersome. There really should be a solution created by Adobe on this. I hope in the near future (fingers crossed).
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