Why did two ball bearings fall out of my pc?

So on my cq60 laptop, i took apart to clean. During reassembly, i see 2 ball bearings laying on the desk. The only thing i can possibly think of that it could have come from its my dvd/cdrom drive. The tray slid open when i removed it but i didn’t hear anything drop. I reassembled everything and irs running great But i have not used the DVD drive yet. Would you recommend trying it or replacing it? I’ve read that hard drives can have some sort of vibration bearings in them But i didn’t open the hard drive only removed it. I am baffled. What do you think?
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