I'm going to disagree.
The search warrant for McFadyen's place listed $360 in twenties to be seized. The balance of what had been found at 610.
NiFong certainly thought they robbed her.
Her word was good enough.
Something must have come up that made him drop the charges, and we just don't know about it.
Unless he found out what happened, I can't see him forgetting about the purse and the robbery.
Maybe finally learning she'd spent 30 unaccounted for minutes unconscious in a car with convicted thief Kim?