I've never stayed there and can't remember what kind of minibar they use at RPR and HRH, but the newer ones have sensors and if you pick up an item for more than a few seconds you are automatically charged for that item.
I lose track of which hotels have those kind and which don't, just make sure before picking anything up.
Can you take things out of the refridgerator to use it for your items? Or...would that be too much work/complicated?
Universal don't use those type of minibars - yet. At least they don't at RPR, and I was there 2 weeks ago.