Originally Posted by kuwagner
How do I find it - if it even exists????
When we as electricians lost floor boxes in poured concrete floors, we used to find them with a hammer. It's not as bad as it sounds, the hammer when tapped gently enough so as not to damage the surface can often pinpoint the location of the hidden box by sound.
Then once you think you have the location pinpointed, it's a leap of faith to start pounding to either unearth the opening, or to make a hole that needs patching. In your case, if it's a box filled with stucco mix, I'd imagine it would sound more solid than the surrounding wall, construction guys, am I right?