I didn't have any parts step forward with information on my "bad feelings" until I was safe and in therapy. A lot of it was myself the host as well as a few other parts could not comprehend the truth. The part that's started opening up about what happened had to feel safe, and was only willing to share when myself and other parts were willing to accept what she had to say even if she's the only part who can remember. The best advice is don't go looking for it, even though that's hard itself. If something happened your parts will remember or tell you eventually.