Posted By:
warshawlawI'd say it's time to stop collecting slabbed cards; keep and enjoy it. 
Edited to add: Some of my favorite cards are ungradeable.
Seriously, if you feel that you have the requisite expertise to examine the card and your examination tells you it is not trimmed, if I was you I would not accept the response of the grading company and dump the card. I've seen the graders make too many erroneous rejections. If you were hesitant about the card or felt incompetent to determine whether the card was trimmed, that's another story. Before abandoning ship on that one card you wanted, I would resubmit to either that company or some other company. I've had cards rejected as trimmed that I knew were ok and they've later been slabbed by the same company.
If you are intent on selling the card raw, I would say it would be best to disclose why.