The IRS uses the date of mailing on the envelope but prefers to have it. See Understanding your CP13 Notice | Internal Revenue Service & Understanding Your CP54B Notice | Internal Revenue Service.
The CP 54B is telling you that there is a discrepancy between the Social Security Administration and what you filed with the IRS. You may want to Contact Social Security | SSA. You will need to mail documents to the IRS once you determine if your information is wrong in the system with SSA.
The CP13 simply says nothing owed and nothing due. You may disagree with that. I am guessing it is based on the mismatch with SSA.
In addition, there may be a fax number on the notices. Sometimes you can send a fax from your phone.
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