So according to T MS:
Dulin never misfiled the tip.
The tip was reported to him as Richard Allen Whiteman - and DD during the interview made a note that he is 'of Whiteman' instead. Unfortunately during filling the first person did not pick that up, but it helped Shank to eventually fix that error.
Apologies for piping up, I just feel bad for DD, because during his and Shank's testimony, it became apparent we have all been blaming him for something that was not his fault.
We discuss the sixth day of Richard Allen's trial. We saw Allen's knives and boxcutters and heard more from the woman who uncovered the tip that led to this...
murdersheetpodcast.com
All my interpretation of the reporting.
Edited, because, ironically, I got the wrong name wrong...