Liam, from the Queen's Road area of Aberdeen City was last seen boarding a StageCoach bus on Saturday 17 November 2018 at Aberdeen Bus Station adjacent to the Union Square shopping complex.
16-year-old Liam was last captured on CCTV at Union Square shortly before he boarded the 13:15, number 202 StageCoach bus on Saturday 17 November 2018, which would have taken him in the direction of Banchory, Aberdeenshire.
A spokesperson for Police Scotland in Aberdeen said:
"At the moment there are no plans to involve the public. We know that many people have offered to assist with searches however we carry out these operations in a highly specialised, methodical way with officers who are trained and experienced. We have a plan in place to ensure that all the land we need to cover is searched effectively and that nothing is left unchecked."
"The land we're covering is also very challenging in places with areas of water and is only being searched by specialist officers and resources. Our priority is always public safety and we don’t want anyone put in harm's way."
"We know that people will be out walking in the Crathes and Banchory areas anyway and we would of course welcome anyone's efforts to keep an eye out for Liam. Please don't think that your offers of help are being ignored - organised public searches can be very resource and time-intensive to coordinate and, at the moment, our time is extremely precious."
It is believed Liam alighted a StageCoach at Crathes (at approximately 14:04) or Raemoir Road in Banchory (at approximately 14:11).
He has short brown hair and walks with a distinctive gait.
He was carrying a camouflage North Face rucksack and was wearing Nike Air Max trainers.
He bought Lucozade, Jaffa Cakes and Dairy Milk at Sainsbury's before he left Aberdeen.