The first few days of the NY season I experienced the same thing. Heard a few sound off early while still in the roost, but as soon as they hit the ground, they all went silent, and the woods ended up being as quiet as a Church.
That spells only one thing......."Hens"!!! Personally, I real feel that this spring season will be much better the second half of the month!! Some years all the action comes early, some mid-month, and other's near the end!! Stick with it, and things will happen!!