You can certainly peel them off and reuse them, but I very much doubt you could return it, and you have to be very careful not to get anything else e.g. paper, dust etc, stuck on them, so they don't lose the effectiveness of the adhesive.
I know I wouldn't buy a used one, because I wouldn't know if internal wires hadn't been broken in the process of peeling it off, but you can always try.
Skye