Seller fraud: any lawyer/audiophiles in NY state?

If there are any lawyer/audiophiles on this forum who could provide me some advice for a fee in regards to a fraud case involving a small 'ring' of users here on Audiogon and dealing with it in the state of NY, I'd be grateful if one of you could reach out to me via Audiogon in-mail. I've been in contact with the Nassau county DA's office and followed their advice regarding demand letter, etc...the delivery period for that has now expired and the carrier has reported it as unclaimed so I need some good advice as to how to proceed from this point forward. The amount is definitely "over the line" so legal action per NY state law is now indicated.

Thank you....