Here's what you are going to be told: "Omigosh, I intended to put my personal account number on those!" So, contact the attorney-in-fact and point out the apparent error so he can deliver his prepared remarks.
Most banks would stand around wringing their hands awhile before they take care of something like this. Don't. It's a breach of fiduciary duty and you are aware of it. If you allow it to continue then you can and should be found liable for it.
If the principal is elderly, the Texas Attorney General's web site suggests: When you suspect financial exploitation, report it to Adult Protective Services at (800) 252-5400.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.