Split into groups of 3, and each lot of people take a path. (you do not need to search all 4 paths at once, as if none of the 3 searched are found to be Morroc, it can only be the 4th.)
This means that if they find it, and someone lies, then none of the other parties will be able to have all 3 people say they found it, as there is only one liar left (at best, you could get a 2-notfoundvs1 found).
If you get both liars in the same group, and get a 2-found vs1notfound, then another group will have all 3 saying they found it.
If you get 2 liars in the finding group saying they did not find it, then the above works, as the other groups will be filled of 3 people saying they did now find it.
