People are oftentimes too sensitive about when a DM inquires about the transferring being detected.
If it was a mistake, or not on purpose then just say that. If you have played several characters and/or several years, its bound to happen eventually, especially if you ever do a merchant or helped supply a lot of allies at any point.
Its a very helpful tool for keeping the fairness factor on the server, and its better to have an occasional interruption for transfer script inquiry than to not have it and let items get passed illegally.