Shredding

So I work in a correctional facility in NYS and our utilization review nurse is in our offices as well. She does death reports and shares our shredding bin.  I intermittently shred on my midnight shift and there were piles of death reports in there I did not read all of it but looked at it briefly. I shredded all of it and would never do anything with the info and don't know the depth of what was there. I alerted my supervisor and she is going to speak with the SURN about either shredding her own documents or not using our bin.  I feel so guilty for looking at it however slight it was. I know better. Nothing was breached, shared or utilized for anything