NO, it's NOT safe to run the microwave without it.
It's not that it's harmful to you--because it's not--but it IS harmful to your microwave. That cardboard cover that you're talking about is called a "mica shield," which, in short, protects your microwave from frying itself.
I'd say talk to Sanyo to see if they can get a replacement for you (which they usually can, or they can at least tell you where to get one). According to their website, www.us.sanyo.com , it doesn't look like they have a support phone number, but they have service locators--I'd say if you can give one of the centers a call, and give them you model, they might be able to help you out with getting the mica shield ;)
Good luck! :)
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