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请问雇主信上需要写上SSN号码吗？

-No.

我只写了名字，公司单位，职位，工资情况。老板联系方式。

开头的地方我没有写USCIS，只写了 "To whom it may concern" 这样可以吗？

-This letter should be issued by HR of your employer, not you!. The letter should be printed in the Letterhead of the employer.