Who Created a Baseline

Does anyone know of a way to identify which user created a specific baseline?  I have 3 users using P6 v7.2 in a SQL environment, all of whom swear they did not create the 4 new baselines that now appear in their shared schedule.  I'm not trying to point any fingers, but without knowing who the system thinks created the BL's in question, I don't know how to address the issue.  Right now, they all want to blame it on P6.