A good package is made up of mostly young nurse bees. They maybe too young to forage. Keep feed on them and be patient.
Leesb, I too am in north jersey (lake hopatcong and I work out of millburn). My bees really didnt start moving until 10 oclock every morning and that was only if it was 48 or better. once they got established they started earlier as long as it was pushing 50. don't worry just yet. Dont expect to see too much going on the next couple days. Its raw out and we are due for alot of rain.