How to find info on merged request

How to find info on merged request

Running ServiceDesk Plus  9.0  Build  9039  on pgsql.  We have a request ID, 1319, that is no longer visible in our system.  We know it existed at one time because we have the email notification that we rec'd when the incident was created.  Now however when we try to search All Requests for it we get "FAILURE": Invalid Request ID".  I suspect it may have been merged to another request but I can't prove that.

How can I either find out whether 1319 was merged to another request and determine which one, or otherwise look at an audit or history log to see what happened to it?

Thanks!
Dennis
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