Any hard information they have is stuff personally handed over such as name, address, cong, year of baptism, publisher status inactive irregular, restrictions, reproved etc, marital status, publisher history, previous congs, possibly job details, blood card information, reason for DS DA etc, etc.
Any other information would be personal opinions and extrapolations of your situation or personality formed by the elders whether true or not or anything the boe felt was noteworthy and relevant to your spiritualy such as menatl health issues, sexual preference or personal struggles maybe with smoking, porn etc.