(1) “Benefit” means gain or advantage, or anything regarded by the beneficiary as gain or advantage, including benefit to any other person in whose welfare the beneficiary is interested.

(2) “Official proceeding” includes any action or proceeding conducted by or before a legally constituted judicial, legislative, administrative or other governmental agency or official, in which evidence or testimony of witnesses may properly be received.

(3) “Physical evidence” means any article, object, document, record or other thing of physical substance which is or is about to be produced or used as evidence in an official proceeding.