Ramifications of orphaned domain controller not being removed properly

I have never had this situation before, but I recently installed a new Windows Server 2012 Std domain controller into an existing 2003 SBS domain. After all the replication and moving of files, shares, etc I had the owner turn off the old 2003 SBS domain controller for the sole purpose of making sure the new DC would do its job. it did, so I was planning on giving it a week and then powering the old DC back on, demoting it, unjoining it from the domain and then probably tossing it. The owner misunderstood my intentions and tossed the old DC. The domain is running fine and has been for several days now, but I am not sure what the ramifications are of just tossing the old DC before demoting it, etc. I have never had this happen before. No exchange in the domain.
thx experts...
bobrossi56Asked:
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Scott CSenior EngineerCommented:
If all of the roles have been transferred and everything is running fine you are ok.

The old DC will be treated as being "Tombstoned".  In a 2012 environment all you need to do to clean up the metadata is to simply delete the old DC from ADUC.

No other steps will be needed.

In older environments you would have had to go into ADSIEdit and clean up AD, but in a 2012 environment you are fine.

The owner made a mistake, but fortunately in this case the impact will be nil and he will have learned an important lesson.
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Seth SimmonsSr. Systems AdministratorCommented:
the new domain controller will have errors trying to replicate to the now-defunct sbs server
metadata cleanup will get rid of those issues cleanly

Clean Up Server Metadata
https://technet.microsoft.com/en-us/library/cc816907%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396
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