Sorry, that last post included a question because I saw an issue with all of the above techniques. The method given above does not take into account config rollbacks and log files. All places where identifiable data may be present. I was looking for a way I could blank the system for resale. A complete factory reset. These things use hard disks where information can be squirrelled away.
The only way I have found to completely clear the system information on an ASR9k RSP is to do a turbo boot. The process is documented on the TAC website, and involves loading a VM by TFTP or USB into ram from the rommon prompt. You need to be sure to tell it to format and clear the admin data. When it comes back, you will need to load the system modules you need, but it comes up like factory with setting the root user and password.
If you are looking for a clean RSP, that's the only way to do it. Otherwise, there is config all over the place in there.