Have no knowledge of what else can be done legally. Maybe put the video on social media with a, "Do you know this individual" caption, although that may be illegal. Or keep an eye out for this regular cafe customer ? Maybe the cafe owner can text you when they come again so you can coincidentally ask her about the purse they found ? Of course the cafe owner may not want to get involved against a regular customer. It's always possible that the woman took the purse to a police station. I trust you tried lost & found.