As a resident of NY, you do not need a Registered Agent. Your business address will be the legal address. The Secretary of State is NOT the agent. This is more of a concern for out of state or out of country (in particular). I did not assume that you were a NY resident, so mentioned it in case.
> The product is a small item measuring 4"x4"x.40" and weighing .95 oz so thinking FBA fees should be low.
0.95 oz should certainly be less than 1 lb. You should check the Fee Preview report to see what Amazon has for your weight and dimensions. If it is wrong, create a case to request a cubiscan to correct it.
> About product having US presence, it is being sold on other sites like Ebay and company does have a Shopify site that they sell through also, but not sure if it is trademarked
> or patented. Will have to find out about that.
You should contact the brand owner to check into the trademark and patent registration that they should have already undertaken. Otherwise, you will need to check with the US registries to see if there is any conflict.
Sometimes no-one says anything for years, but as soon as you have a product that becomes popular, pre-existing trademarks or patents will suddenly initiate action. That might require consulting with an intellectual property lawyer.