She wouldn't have her Condit-key if she was giving it back to him during the ride around DC in his little red car.
What was in that infamous watch box that was discarded?
I imagine they didn't keep all the trash that was in the can, only the watch box.
Unfortunately, a pinky ring and Condit-key were inside it when it was initially discarded. Among other things, eh?
Condidit.
Because she had already spoken to the person she was waiting for a call from, Condit, they had set up this date, with either him picking her up or her meeting him in the park.
It would be very unusual and even highly unlikely that your cell phone would be left behind.
If you page someone 24 times in 48 hours you usually keep your phone close in case they call you back... unless maybe you are going to meet them...