There can be instances where a survey stone applies to a different circumstance than the individual residential lot.
For example, I can think of a subdivision that was designed such that it fell in all four quarters, partially, of a PLSS section. The center of section stone existed, but, fell out in the middle of one of the standard lots in a standard block. Actually, it was in an area used as a garden. A good friend of mine found the center stone while working on a survey for a tract outside of the subdivision. He flagged it and wrapped bright survey flagging around it to make it easier to find in the future. A few years later he needed to tie to that same stone. The land owner had removed it because it was in his garden and was deemed inconvenient once he knew it was there. He did not understand the significance.
Today, after several changes in ownership, the garden is long gone and a standard survey bar can be found at the original location of the stone.