Sorry to alarm you, kid, but most electronic devices have physical bugs in them if you leave them lying around long enough. Bugs get in everywhere, but they're not so adapt at getting out of everywhere.
Honestly, it's best to just not think about it. So long as it crawled inside the device, it's out of sight and therefore should be out of your mind. If you really are super bugged by it (pun intended), you best learn how to dissemble your device and reassemble it, which I and the manufacturer would NOT recommend.