What town was this in? open container charges are typically municipal ordinance violations and the fine depends on the particular municipal code. Your question location says Newark - if the ordinance was there the max fine is $500 plus costs. Other towns have higher fines. Hoboken for example has a max fine of $2000. An attorney can investigate the circumstances and mitigate the penalties based on the circumstances.
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The only State open container statute is a motor vehicle infraction, 39:4-51. If you got that you may be able to just call up and find out the fine and pay it I believe. If it is a municipal ordinance I do not think you can do it without going to court since a schedule of fines is not in the books.