Well I have to say you learn a lot here in the field, when checking a waterbed it is important to completely take the bed apart. Every square inch of the bed needs to be taken apart and carefully inspected for bugs.
So lesson learned – you must be diligent in your endeavor and track down those pesky BedBugs. This picture above is the plywood that holds up the mattresses or waterbed. Check out All Things BedBugs