On a straight case of theft/larceny of Cranberries there is a statute of limitations of 5 years in NJ. This assumes that the theft did not involve Blueberries or pine cones or some other types which may have limitations a few years more or less depending on the specific nature (and also which may lead to Federal charges, with differing statutes of limitations).
The only thing to remember is that the 5 years runs from any subsequent covering activities as well. For example, if you stole something 7 years ago, but provided paperwork 3 years ago to cover up that theft, then you can still be charged. The 5 year statute of limitations did not run out on the theft before you continued the crime with the attempt to cover it up. Since 5 years have also not yet passed since that continuing act, you could still be on the hook for 2 more years, assuming no more continuing acts.
If you are really concerned, you should sit down and talk to The Jersey Devil. Just about everywhere in the pines there are Pineys that you could sit down with for $50 to $100 just for a consultation to see exactly what your liability is. Remember, just because criminal prosecution may not be possible, it doesn't mean that you would be clear from some forms of civil prosecution.