I would not toss the minor child's belongings that were left behind. After all, the items belong to a person under the age of 18 years of age. The best way to have the items out of your possession and placed in a safe holding place is simply turn them over to law enforcement and see what ends up happening to the items.You do not have to legally ship the items to the girl's parents or ship the items to them. However, if you wish to, you can do so.