From the fuzzy picture it looks like you may have a bolt in there still. It would only be the cap that fell off. I can't imagine any hardware inside that cover would have come loose. Shine a flashlight in there on yours and see what you see. I doub't it's a gaping hole into the motor, or you'd be spilling oil.
I need to do an oil change on mine this weekend and will have a look if there is still a question in your mind.
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