Found this bolt in my oil

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Wraith272

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Went to change my oil and heard this fall out. Any ideas what uses this kind of bolt inside the engine? I looked at all the parts diagrams I could find and didn't see any that matched this. Almost looks like the same kind of bolt that holds the oil filter cover on. Just want some ideas where to start looking for the rest of the broken bolt?

Also, before I found this bolt, I've been hearing a light clanking sound after a cold start until the engine warms up and then it goes away, you can kind of hear it at idle if you compare the beginning to the end of this video https://www.youtube.com/watch?v=3gWuqhcvUIk but unfortunately I took that video before I figured out that you get better sound with the skeleton backdoor on the GoPro, Any ideas?
https://www.youtube.com/watch?v=3gWuqhcvUIk
 

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I've only taken apart 2 raptor 350 motors, but I don't remember any hex head bolts being inside the cases.
Has the engine had work done to it in the past? Could be someone used the wrong bolt.


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