Hello NY Folks

I was approached by a gentleman at the Petroleum Club last night about some unclaimed property his family supposedly has in NY. They are a very old family, Stein I believe is the name, who owned the largest department store and clothing manufacturing businesses in the city pre-depression. His father died last year, and not long afterwards he started receiving letters about unclaimed property, but each letter asks for funds in advance to help him find the property.
He thought it was probably a scam, and I agreed, but also told him there are ways to search out unclaimed property in each state. This is obviously not my area of expertise! Because of his families LONG history in NY, it's entirely likely they do have some unclaimed property out there. So, my question is, can you lead me to a location for him to search in your state? Or, does NY send out letters asking for money to provide unclaimed property? He said it is on "official looking" letterhead...but I'm sceptical about that
