they can come out of the ground thousands of years later in exactly the condition as when then they where originally buried! Very different than ancient burial glass beads, or heirloom beads. So many different types of analysis come into play in identifying ancient burial stone beads. One must handle many, many authentic ancient stone beads; constantly look for a fakers ignorance, laziness, or misplaced technology. looking for incorrect tool marks, looking for the correct type of wear indicator, the exact correct type of style for the era.

That said, I think your beads are authentic, I do not think the perforations are large, actually at that time small perforations where more difficult. I am sure Will, Jan, or Matt would have more useful information.

A not so interesting side note: I have noticed that most of the e-bay beads sold directly out of Thailand, and China are fake(BCN contributers excepted). I often, and generally speaking notice the dealers selling ancient beads directed out of Afghanistan, Canada, EU, Germany, Mauritania, Pakistan, Singapore, UK etc.. are more typically authentic.