on the server that is running the SSRS Service, you should find the Reporting Services Configuration Manager.
run that, and there is a tab to show you the database it connects to, as well as what port the SSRS service is listening to:
if you connect to the sql server and select * from ReportServer.dbo.Catalog and and select * from ReportServer.dbo.ExecutionLog2 , if there are only two records, there are no reports at all, and if there are no recent records in ExecutionLog2 , you could probably deprecate it; if the reports exist or executions exist, it is in use, you can follow the links in the Reporting Services Configuration Manager and find if it is running and more details.
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