Is there a place to store luggage before entering the museum while I visit it?

Coat room, on a rack. Ask a docent for help. Patricia in events could help if it's sensitive or valuable they could put it in an office...

Never saw the lockers only cubes.

There are lockers, but not big enough for luggage. You could inquire at front desk and they could accommodate you. Donna is very helpful!

Not that I am aware of. But they may keep it in there office area if you ask