Atreps is the same site as Athribis/Atribis. I have noted this most recent discovery of thousands more inscribed ostraca here. Follow the links for background and earlier discoveries at the site.
This BHD essay does a good job of answering the questions What do they say? and Why should we care? Excerpt:
Of special interest are more than 100 mainly Demotic-Hieratic horoscopes, which complement earlier discoveries of about 130 ostraca documenting celestial observations and possible astrological charts. Generally speaking, in ancient Egypt, astronomy involved observing and measuring celestial bodies, while astrology interpreted their significance. Horoscopes recorded the positions of stars and planets at specific moments so their meaning could be interpreted. It seems clear that Atreps served as a hub of astrological and astronomical activity.
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