Your ficus probably have an infestation of scale insects, which can go undetected by those who don't know what to look for.

Though there are many different species of these pests, the kind most often seen on ficus are small, flat, brown 'bumps' located on the leaves and along the stems. They don't move but can be removed by a fingernail or other flat object.

If you're wanting to sell YOUR ficus, the scale infestation makes them worth very little, in my opinion. Other than that, the price would depend upon the condition of the trees, size of trunk and root ball, etc.

Could be on the tops of leaves. But even more challenging to locate are those on the backs of lavs. In both instances, they tend to be alongside the mid vein.

See the link below...

Here is a link that might be useful: soft scale on ficus

A greatly enlarged view of soft scale at the link ..

Here is a link that might be useful: soft scale