There is no need to attempt to set up these presumed "treasury" accounts as the United States is already under obligation. I have had numerous successes with sending an account statement back to the issuer with this written across it; "This name and account number are the property of the United States. Please forward to the owner in care of the Treasury of the United States"

Here are pertinent USC sections;
12 USC, Section 411
"...said notes shall be obligations of the United States and shall be receivable by all national and member banks and Federal reserve banks and for all taxes, customs, and other public dues."

18 USC § 8 - Obligation or other security of the United States defined
The term “obligation or other security of the United States” includes all bonds, certificates of indebtedness, national bank currency, Federal Reserve notes, Federal Reserve bank notes, coupons, United States notes, Treasury notes, gold certificates, silver certificates, fractional notes, certificates of deposit, bills, checks, or drafts for money, drawn by or upon authorized officers of the United States, stamps and other representatives of value, of whatever denomination, issued under any Act of Congress, and canceled United States stamps.

31 USC, Section 3113
(e)
(1) The Secretary shall redeem a direct obligation of the Government bearing interest or sold on a discount basis on receiving it when the obligation—
(A) is given to the Government;
(B) becomes the property of the Government under the conditions of a trust; or