41 CFR § 301-11.16
What reimbursement will I receive if I prepay my lodging expenses and my TDY is curtailed, canceled or interrupted for official purposes or for other reasons beyond my control that are acceptable to my agency?
June 9, 2020
If you sought to obtain a refund or otherwise took steps to minimize the cost, your agency may reimburse expenses that are not refundable, including a forfeited rental deposit.