Can police do an inventory search of my car without my knowledge?

If my friend was listening to a scanner and heard my name in code come across the scanner, saying inventory search before it, is that illegal? I was at work when my name came across the scanner and my vehicle was parked out in the back parking lot. I had no knowledge of this happening and would not have even known about it if it wasn't for my friend recording the scanner. Now, I was recently arrested in October of this year, but booked and released with conditions to remain law abiding. Does that still give the police the right to do an inventory search without my knowledge? Let me not forget to say that my arresting charges are still pending. I don't go back to court for my first appearance until December of this year. There is no convictions to any of these charges. I don't feel that was a legal search because technically I'd still be completely unaware of it entirely if it wasn't for my friend to play the recording for me.