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As others have said, they don't always gobble. However seeing hens and no toms/jakes is a bit odd. There is a chance those hens are already on the nest and the Tom has moved on to "greener pastures". It doesn't mean that Toms/Jakes wont come back. As the pickings get less and less for them as the season progresses they will start to wander.
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Anytime we see hens the toms are not far away, I've had many a sighting on my trail cam in the afternoon in fairly pen woods near stream edges, if you find some sign in these areas might be worth a sit.