Help with Used AS/400

Hi,

I just bought a "pre-owned" 9402 Model 400 AS/400.  According to the
seller:

The 2130 Processor has a Mfg List price of $8000.00. This machine
includes IBM Operating System Software OS/400 license for version
4.3 which is transferable to buyer.

The unit power up and starts the IPL sequence.  However, part way
through booting,
I get the following message:

The system was unable to determine the system unique identifier,
or this prompt was forced from the Dedicated Service Tools
Work with System Values menu on the previous IPL.

A service action may have been performed requiring
entry of a new system unique identifier.

Contact IBM immediately and order specify-code 1311 to
obtain a new system unique identifier.  The following
information will be needed to place the order:

   System serial number . . . . . . . . . . . :   S/N XX-XXXXX
   System type / model  . . . . . . . . . . . :   9402 / 400

Does this mean that the software has been wiped from the system?  I
didn't receive any CDs with
the machine.  How do I go about ordering the specify-code, and if
necessary, a copy of the OS?  If I am
going to get charged by IBM, I need to have a conversation with the
seller.

Thanks in advance

Mike Madore