Ask his Momma. Recruits should have called next of kin upon arrival to the MCRD and repeated a message to let them know that they had arrived safely. They will also be able to send a forwarding address at some juncture. If not, contact his recruiter.
It will be about two weeks before they send an address. Till then stock pile letters to them. Just don't say you want them to come home to much. Stay positive and up beat. If you still don't get an address contact Sandboxx they will find out for you. Down load the app. It is expensive to send letters through them but sometimes it is worth it.
Parents. Ask them.
Give it couple of day
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