Verbal agreements are valid. The tricky part is proving the terms of the agreement. For example, what was the term of your agreement? (For how long did you and this other company agree to maintain the deposit boxes on your property?) That's just an example, but a question worth considering, nonetheless. Did you reach an understanding as to what would happen if one party to the agreement fails to fulfill its obligations or fails to timely respond to the other party's communications? Also, to where would you relocate the boxes, if you could?
There are many facts missing from this question, but which remain essential to providing you the best possible advice. I strongly suggest you consult with an attorney to discuss all the facts and circumstances of your agreement.
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