1) when was the request really closed vs when was it reopened (days / months / minutes difference?)
That's impossible to tell because the Activity log shows no evidence of a re-open.
2) what status was the ticket in
It transitioned from OP -> CL... then directly back to OP if you read the logs. This is impossible due to restrictions placed on the status transitions. It should have gone to re-opened.
3) what are the status transitions permitted from that status to the current status the ticket is in ?
4) Is this a primary/secondary env, or Advanced Availability ?
-Primary Production
5) do you still have SDM logs when the request was originally closed and logs around the time when you think it got reopened?
-unfortunately not the anomaly has fallen off the logging time window.