Where could I find the FOD examples of C17?
You can search the National Traffic Safety Board here

https://www.ntsb.gov/_layouts/ntsb.aviation/index.aspx

as a starting point.

Under Aircraft:Category, select Airplane.

Under Model, Select C17. 

Scroll down and select  Submit Query.

There are couple of hits on C17s on the first page of results, I didn't look at  further pages.

Try this stack exchange link also on the same occurrence, but not just limited to C17s.

How does this vortex form inside a jet engine?