Welcome to 2CarPros.
I can't imagine that it is going to get past the valves and into the exhaust, so I suspect it is still sitting on the piston. When it was started, was there a lot of noise? Have you tried getting it with a magnet?
They make a scope camera that is used to get into small places for inspection. You may want to contact a local parts store and see if they have one to rent. That way you can see where it is and if any damage was done.
Let me know if I can help.
Joe
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Sunday, June 30th, 2019 AT 7:16 PM