Police are trying to identify the owner of a bag left at the West Sabine Hut in Nelson Lakes National Park.
An note attached to the bag of gear said the person would be back to collect it on 7 April.
A tramper found the bag yesterday and told the Department of Conservation about it.
Police would like to hear from the person who left the bag, which contains clothing and tramping boots, or anyone who knows who may have left it at the hut.
A helicopter carrying police search and rescue personnel has been checking the area this afternoon.