I understand what you're saying however this is not very helpful.
There was a page on boundless regarding how to document such cases. Can not find it at the moment, but it involved a sworn affidavit of some witnesses.
Anyway, at the current point I see 2 avenues:
1. Phila PD records
2. Sworn affidavit of couple witnesses
3. Forget about it, and hope that the statement from N-400 instructions:
"You do not need to submit documentation for traffic fines or incidents that did not involve an arrest or did not involve drugs or alcohol, if the only penalty was a fine of less than $500 or points on your driving record." will be interpreted as: "You do not need to submit documentation for ... incidents that did not involve an arrest or did not involve drugs or alcohol, if the only penalty was a fine of less than $500 or points on your driving record"
mzu got a reaction from Mike E in N400 and unable to get a record of a 15 years old municipal fine
mzu reacted to doshi8000 in I130 documents scanned in disarray by the lockbox: unsolicited evidence or wait for RFE?
mzu got a reaction from FranckDernoncourt in N400 and unable to get a record of a 15 years old municipal fine