For E-Series we don't supply the shell credentials without a service ticket.
Depending on system type and firmware, the password could be changed from our normal credentials.
Also depending on system type and firmware, the method to wipe the system clear of config can be different.
To assure proper guidance for both of your situations, I would suggest opening a support ticket and we will be happy to guide you through the process.
US & Canada - 888-4-NETAPP