So i looked this up.Several sources say the coin sets were buried under the foundation stones. <br>The way it's worded makes me think they mean <b>corner</b> stones.And that would make sense.<br>It wouldnt take a whole lot of effort for the building's owners to check.That would at least discourage others from trying at these most likely locations.<br>*edit: do these old building use metal reinforced stones? If not then a modern metal detector might provide clues