We believe we have solved the shugborough Shepherds Monument Cypher mystery, but we need help proving it!?

I am a mason and dint understand the question. If this is a Masonic thing there will be no way to figure it out. For example my screen name is a is an masonic anagram but there is no "key" used to solve it. Someone tells you what it means and then when you see it it reminds you. It does look a little familiar