N.J. Stat. Ann. § 54:4-84

When goods and chattels have been distrained, the collector shall give public notice of the time and place of sale and of the property to be sold, the name of the delinquent and the amount of his tax in default, at least five days previous to the day of sale, by advertisement posted in at least five public places in the taxing district where the sale is to be made. The sale shall be at public auction and, if practicable, no more property shall be sold than is sufficient to pay the tax, interest and costs due. Any surplus shall be returned to the owner. If there shall be no purchaser for the goods and chattels exposed for sale, they may be purchased for the benefit of the taxing district by an authorized officer.