noun
certificate of theft; theft certificate
A document issued by the police or other authority to certify that a theft occurred, typically required for insurance claims or official procedures.
保険金を請求するために、警察で盗難証明書を発行してもらった。
To file an insurance claim, I had the police issue a certificate of theft.
Compound of 盗難 (theft) + 証明書 (certificate).