a friend had a similar problem. He could smell gas but nothing was being detected.
Eventually, he opened up a wall (where it smelled the strongest). Turned out it was an old gas line in that had been poorly capped off, and the residual mercaptan was causing the smell (there was no gas in the line anymore, so no danger)
He put the cap on properly and the smell went away.
Might not be too helpful to your situation, but it is helpful to know that mercaptan =/ dangerous gas around
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