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It is a close friend, not you that it happened to. So:

Be a friend help him clean up, console him. Help him repaint. If you have evidence give it to him. Let him decide what to do with it.

Don't volunteer information about a suspicious son to the police.

Suggest he get a monitored alarm. Maybe a concealed video camera system in case it happens again.

Double key extended dead bolt locks on all exterior doors, locks on all windows. Take the inside key and hide it when you leave for more than a few hours. They also make a long strike extender which helps hold the door jamb together better, for kick burglerys. You make it harder so they go somewhere else. Make them have to leave the way they got in.

If he has serial numbers of the items that were stolen that will help with the recovery (if he really wants the stuff back). He may want to identify the new items with one of those etchers.

Your suggestions should be as polite as can be, most people don't like, need or want advice.

The fact the police actually took finger prints is a pretty big deal. That's usually reserved for murders.

My two cents.