I'm not sure, I deleted them but more and more kept coming up. In the end, disaster struck, Unity hung, I had to force quit and my Scene became corrupted and refused to load. An hour later I'd fixed a hard drive error, deleted a few non-essential Unity folders and my Scene loaded. But it's put me back a bit, certain geometry is invisible, some bitmaps have lost transparency settings, particles have resized etc...i'm piecing it all back together now, then I'll start again with the IAP integration. It seemed to be the WWW class that was causing me problems in the end, and the BB In App scripts made use of those.
Have you a specific app planned for BB, Jean? I had a contact who got me a device on the strength of my last app AND my project details for my next app that I was building for the BB Store. Last I knew they'd all been taken though.