You have two variables at work here.
The first is that a larger flock of feeding turkeys (and resultant sign) will dwindle as the breeding season heats up and the birds continue to separate. Hens will stake out nesting areas and gobblers will fight for local dominance as the flock spreads out.
Secondly, the diet and preferred food source of the turkey changes rapidly in the spring. When it's still cold, grain for carbohydrates and energy is the choice. Next comes tasty green shoots, blooms and small berries as soon as they are available. Finally, warmer weather brings insects and their desired protein.
The net result is that hunting a foodsource like forest scratchings is unreliable. The turkeys were just passing through looking for a bigger and better deal. Maybe within a day or two of finding the sign, give it a try, certainly not a week or more later. Now that you know birds are in the area, your time would be better spent trying to find out where the turkeys roost and where they prefer to be at certain times of the day. (They're not always eating.)
"The joy of living is his, who has the heart to demand it." Teddy Roosevelt