I have a situation while applied for my Citizenship application as
follows:
I have received my interview letter for USCIS( form 797C) .
Yesterday I have received a letter from USCIS indicating that FBI
background check using my finger print has revealed that I have an
arrest record. So I have to bring
a) Certified or original copy of arrest record
b) Court Dispositions showing how it has been resolved

at the time of interview.
That reminds me an incident during in 1996 in PA I have been charged for "Shop Lifting" due to a misunderstanding. I have received a court copy for fine (around $200).
Unfortunately I have to go back to my home country imidiately for a family emergency . So I have called the court and asked what to do and they have advised me to pay the fine and plea guilty since I am leaving the country soon and everything will be fine. So I did it.

I was not aware of it as an "arrest" and have not mentioned in my
application.I don't have any paper works about it with me. Currently I am a permenent resident since 2001.
What should I do? Pl. advise