The two numbers are not interchangeable. When you initially submit your report, you will receive a temporary confirmation number, which will start with the letter T and be followed by a series of numbers (e.g., T21000181). After a police supervisor approves your report, you will receive your permanent case number, which will start with the year, a hyphen, then a series of numbers (e.g., 2021-80000236). The permanent case number, starting with the year, is your official police case report number. It is the one you should provide to your insurance company if needed.