If you're a Global Entry member with goods purchased purely for your own personal use (not biological or otherwise subject to special considerations - just everyday stuff like clothes, electronics, etc.), and they clearly fall within your personal exemption, do you have to declare anything when going through customs? Will they penalize you if you don't?
From what I have read online, some people say you will annoy the officers if you do, and some say you are required to declare everything even within your exemption. I don't get what the rules are.
P.S. I get that "always declare everything" is the safe advice, that's not the point. I'm asking what the actual rules are, not for mere guidance. A link to an authoritative page would go a long way.