Realtor Disclosure when buying an off market property?

[Michael Elfant]

Hi All --  Specifically in New Jersey, does a licensed agent need to disclose to a seller that they are licensed when purchasing a property directly from them.  The purpose is not to make a commission but to act as a principal in the transaction.  

Also, how does this apply to wholesaling?  

Furthermore, if you do have to disclose, when should you do so?  During the initial negotiation or should it be a line item in your contract once you've agreed on price?

Thanks!