"Second, I would not assume that the person who created the memorial just imagined what they entered, although it would be a good idea to ask questions."
My cautionary note about folks' sometimes making stuff up stemmed from a recent message board discussion with a chap who invented where he thought a relative was buried, then added a whole lot of speculation about what family he belonged to.
The cemetery he placed the memorial for did not exist as a burial site until about 70 years after the subject person died. The memorialist did not have any idea where in the County his person lived (having done no research in estate, land, tax records). He placed the person in the cemetery because there were folks with the same surname buried there. I happen to know who those folks are descended from, and that couple was not related to the folks speculated as relatives by the memorialist, nor did any record of the actual family (deeds and estate records) suggest any relationship with the memorial-subject person.
In lieu of having any evidence, the memorialist further opined that maybe a descendant or other relative had created a gravestone for the memorialist's subject. However there is no such marker for that subject in the target cemetery. And since the memorialist did not know where his subject or speculated relatives lived, he could not even speculate a sensible particular area of the County.
In addition, Patriot Coal Company has destroyed several ancestral-persons' home-farm cemeteries in the past couple of decades (and before them, Consolidation Coal did the same). In one case, some minor bad publicity stemming from a lawsuit forced the company to move most of the markers from ~one~ of the cemeteries to another nearby cemetery. Subsequently some kind soul came along and photographed the markers in the second site, and posted them on findagrave, not noting where most of the gravestones had come from. Patriot did *not* move the actual remains, according to at least one witness to what they actually did. Now they've filed for bankruptcy in a NY court, although their fracking activities in the Pittsburgh Vein must be making them scads of dough.
Hence the suggestion of caution.