Not sure on the exact law, but be sure what you do is reasonable.
For example, I would imagine you have his cell number. Be sure to text him (save the copy) asking when he is going to come claim his stuff. I would also send him a letter to his permanant residence (ie- parents) asking the same. Then if no answer, send him a registered letter saying he has 15 days or something to get everything.
Where you can get into trouble is if you don't take reasonable steps to get his stuff to him.
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