Honda S2000 car driven without oil cap about 4 miles. Found 2 slivers of metal

What is your question?

Oil changed. tech forgot to put oil cap on. drove about 4 miles. heard growling noise. After replacing cap car runs fine

What makes this problem better or worse?

problem gone. is there engine damage

How long has your 2003 Honda S2000 had this problem?

two days