The way you find out is by making a FOIA request - probably to CBP. The way to find out if it matters is to take the file to an immigration lawyer. People who came here as children do have options, and if you are looking to help him with his status, he is probably in a better situation than most.
Yes, most likely. The agency with the record would be Customs and Border Protection. Depending on his circumstances, it might actually help him because that record would be proof that he entered before he was 16 and therefore might qualify for DACA. Please see an attorney to talk over the specifics and to request a copy of his record. Best of luck!
What record? Criminal record? Immigration violations are not, as a general rule and with some exception, criminal offenses. Multiple illegal entries may make them criminal though.
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