So close but so far away!
Regardless of which monument is senior, what I see is one guy never bothered to dig a hole.
JA, PLS SoCal
pull them all out and set your bar and move on...
I cringe every time a non-capped monument is labeled as being worthless. Look up the surveying regulations for your jurisdiction until you discover the specific date when capping/tagging of survey monuments was first required. That said, probably 90 percent of the work I must follow for control pre-dates said policy.
A nice 3-1/4" aluminum cap on a flared pipe. Pull the pins, tip the new cap upside down, place pins in the pipe set pipe and cap with the iron inside. It will cost way less than arguing back and forth about .04'.
Get a 12" diameter sonotube, place it around all that metal, dig down so that only a couple inches of each of the various pipes & bars are in dirt, fill with concrete and place a 12" metal plate on top.
Return 10 years later to count all of the punchmarks and chiseled "Xs" that have been added. Post the pic for those of us who are still around. Maybe in the Humor section.