The sketch of the inscribed block presented by the Greek archaeologists (top); Chugg's reconstruction from the 1970s photo shows how the P of PARELABON was cut off the block when it was shortened. [Andrew Chugg (red characters in the inscription); American School of Classical Studies at Athens (bottom photo)]
2300 years from now archaeologists may discover the tombs of zero or hilderbeast and declare it a Superfund area.
I read some speculation that it is the tomb of, Olympias, the mother of Alexander. The dates - as cited here - would make sense. Although she was executed - stoned to death - by political rivals, she may have been given a royal tomb. She would have been a royal and prestigious figure, simply because of being the mother of Alexander.