I have seen plenty which were constructed with no regard for topsoil...simply push soils inward toward the green's center, shape and plant grass.
One of the tell-tale signs is a slightly elevated* green with low areas* surrounding...hopefully draining away from the front, but that, too, is not always the case.
*The elevated and low areas are in relationship to what the natural terrain appears to have been
The advantage of such greens is that can be constructed without hauling material from one part of the site to another. Hence: "push-up", rather than excavate, carry/haul and then build. The style is minimalist in some ways. After all, it is rather simple. But, many courses now constructed use earth-moving haulers (scrapers and dumps) to manage soils across hundreds of acres. The result, when properly deployed, can avoid the push-up look. A trained eye and designer can manage reasonable amounts of earthmoving to create an almost natural look and feel..as if features we set into some sort of existing terrain...even when one suited to great golf may not have been there to be begin with.