Wanted: Avid Juicy pad retainers

Does anyone know if it's ok to ride without them for a while?
I ordered them today - should arrive next week.
My boss wants to borrow the bike for a light xc spin tomorrow. I've heard some people ride without these retainers and pads actually stay in place. I've no personal experience though.
I just don't want to kill somebody who pays me money every week.