Reece, who is from Fife, was camping with friends on the north shore of Loch Rannoch, near to Killichonan. His friends saw him around 11.30pm on Saturday, 18 March.
Reece is described as 6ft, of medium build with dark hair. When last seen he was wearing a black long-sleeved t-shirt with distinctive white letters on both sleeves spelling out – MA STRUM, black jogging bottoms and black wellington boots.