31 C.F.R. § 248.5
Notwithstanding the provisions of § 248.4 , if in any case involving a financially responsible claimant it is impracticable to obtain the execution of Standard Form 2244, with or without sureties, the officer or employee responsible for handling the claim, in his discretion, may accept an undertaking of indemnity in the form of a written statement or letter, substantially as follows:
(Check description)
and the payment of the substitute check, the undersigned undertakes and agrees to save harmless and indemnify the United States of America, its officers and agents, of and from any and all liability, loss, expense, claim, and demand whatsoever, arising in any manner by reason of or on account of said original check (or checks) or the stoppage or payment thereof, or the issue or payment of the substitute check (or checks), to replace the same.
The undertaking of indemnity should be appropriately witnessed, and if it is executed on behalf of a corporation or other business organization, the individual executing the same should furnish proof of this authority to so act. In appropriate cases, a foreign language translation of the foregoing letter of indemnity may be accepted.
31 C.F.R. §248.5