If the RMA appliance does not have anything installed, and you are not getting the standard boot to AsyncOS, you will need to follow-up with the case that was opened for the RMA, or you will need open a new support case:
https://tools.cisco.com/ServiceRequestTool/scm/mgmt/case
You can follow the quick-start guide:
Cisco IronPort M670 Quickstart Guide
Upon boot - you should just be following the standard turn up process. Once the appliance is online, assign a temporary IP address, and migrate the old configuration as needed, if applicable.
Hope this helps!
-Robert
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