How can I open a Fellowes P-7C paper shredder housing?

My shredder is jammed. Reversing it drew paper up inside. It will not turn in the forward gear. I just want to clean it out. I removed four screws from the bottom, and can pry the outer edge apart all the way around. But something in the middle is holding it together and I can't figure out how to release it.
Jerry, November 2013


done
There is a fifth screw in the center, under the foil label. Lift the corner to find the screw and preserve the model number and barcode on the label. While you have it open, if you care to remove a few more screws, you can grease the gears to extend the life of the machine. There is one gear (the thin, large-diameter one in the middle), that strips out and stops the machine, but the factory grease is inadequate, so generously lube all the gears with a Q-tip and the best quality grease you can find.

Jerry, November 2013
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