Also, I should have suggested making a report about what you experienced even though it happened years ago. There are groups that investigate the paranormal and there might be one in the area that the school is in. Even though it is a "cold case" there might already be one or more reports about something paranormal occuring at that school. Even if there aren't if someone reports a paranormal experience at the school in the future they'll also have your report to look for any pattern that might exist.
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