The only thing I can think of is the police radio tapes from the night of the non-event. Osborn put in a motion to have those preserved but somehow they were erased anyway. Apparently they record over tapes after a certain time and I doubt the defense would be able to prove anything deliberate but I'm sure they're suspicious since this is Nifongland.
Well, it just doesn't wash with me that the tapes were simply recorded over because there was evidence on them as to when the "victim" first complained of rape. In the case of serious felonies, those are usually preserved, especially in absence of a 911 recording which are routinely preserved as evidence. We didn't have a 911 call regarding a rape, but we had police communication recordings as a substitute. Now, they may have been recorded over out of mistake or incompetence (nobody thought to keep them in lieu of no 911 call recording), but it looks to me like an attempt to water down Shelton's observations.