Strange there is no evidence of water anywhere. I'd shut all the valves off in the house but leave the house inlet main valves open. Using a wooden dowel, I would 'stethoscope' the water lines. Place that stick against a water line, the other end placed against your ear. You should hear the hissing sound of a leak. It's just a matter of testing various locations to find where the hissing/gurgling gets louder.
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