“Not hard to see how this could happen or existed and no one alive today would know anything about it.”
You might want to finish that statement with no one cared about it either as for almost 60 years nothing was mentioned and nothing obviously was marked. And it stated in the article that “a person” finally said something. One?
rwood
If only one person brought this to the authorities attention, then it would not be hard to believe that if that one person hadn't come forward, then the coffins would still be buried under the schoolyard without anybody realizing it.