When answering an ad in the newspaper with only a P.O. Box/no name or # listed. What do I put on the envelope?

Question

It's a position for a legal secretary at a small law firm. Not a "company" that would have a HR I could direct it to.

Answer 1

Your return address                                                   Stamp

                                      NAME OF COMPANY

                                      P.O. BOX {the P.O. box number}

                                      CITY, STATE or COUNTRY  ZIP

Answer 2

Try: TWIMC (To Whom It May Concern)

On thinking that over...Ix-nay.  It sounds flippant.