There were two IP's associated with these comments.
107.77.223.177
and
172.58.139.162
One IP was responsible for all of the comments regarding medical information (which can be confirmed in part by the autopsy, also available unredacted (mostly) in the files(.
I tried to follow up on the FBI effort to get the cell data for both of these. As far as I can tell, the rPtND1Si post resolved to a new jersey IP (this is the AT&T customer), and the second resolved to a sprint customer (swam8WIF). If you look up the second IP, it resolved to the Chicago area (the sprint customer). The sprint response to the FBI record request stated that their system used "dynamic IP". Its not clear to me the FBI followed up on the sprint customer any further. My read was they couldnt get a location from that IP because of sprints internal system.