This article on the recently announced discoveries at the Nahal Zohar excavation covers the earlier information and also interviews excavator Dr. Eitan Klein. It has some new thoughts about what the pyramid was for:
“The heap is five or six meters high above the surface of the hill, made of huge stones,” Dr. Eitan Klein told The Times of Israel over a phone interview. “We immediately noticed that someone had dug at the top of the structure, probably looters who had identified the grave.”And more on the scroll fragments:“At first, we thought the site could be just a tomb, but later, we noticed the shape of the original walls, and we understood that the structure was a building,” he added. “Eventually, we identified it as a tower or fortress dating back to the Hellenistic period, or 2,200 years ago.” ...
“We know that the main road linking Edom — modern-day Jordan — to Gaza passed directly beneath our structure,” said Klein, co-director of the excavation for the IAA alongside Matan Toledano and Amir Ganor. “We believe the building served to safeguard the road and may have been used by Ptolemaic officials to collect taxes from travelers.”
Although looters reached it first, archaeologists still managed to recover a wealth of organic and inorganic findings, such as papyri fragments inscribed in Greek, wooden tools and fabrics.I don't know if that is based on already deciphered content or just on the suggested purpose of the building.While additional research is required to decipher the content of the papyri, Klein said that they might have been part of tax documents.
There is also more discussion of the coin finds.
Background here.
Visit PaleoJudaica daily for the latest news on ancient Judaism and the biblical world.