May 06, 2019 · May 6, 2019. To report a lost, stolen or destroyed certificated CPB or CSB, contact Customer Service and provide the following information: Your Customer ID. Your address at the time of purchase. The bond certificate serial number, if available. The exact name of the registered owner as it appears on the certificate. For more information, visit .... Call Us. TreasuryDirect customers: Heavy volume is slowing our response time to calls on the phone. You can call us from 8 a.m. to 5 p.m. ET, Monday through Friday, but please.