Most of us realize that it is against the law to stash a cache in ANY national park.
Here in New York State, it is also agains the law to stash a cache in ANY state park. "Prohibited to leave any personal property...."
It might be advised to check the New Jersey laws as they affect Hi Point and Stokes Forest.
The topic was explicitly discussed as it pertains to geocaching at our local Department of Environment Control and they issued a department policy reenforcing the general state law.
Note, that Rocky River Cache (a beautiful hike and experience, by the way) is, under this provision, an illegal stash. In fact, the trail head is specifically posted as off-limits ANY trespassing from December 1 to March 31. Purpose here is to protect the winter habitat of the bald eagle. The state purchased the river valley specifically for this purpose.
I appreciate that this subject is extremely disappointing news for all geocaching and would be delighted to be corrected. Anyway, all responsible participants would do well to check on their local laws and regulations.