Exchange 2010 IS/AD Interactions Warning

Hello, we have a single Exchange 2010 SP3 server with all roles installed, we are having an issue with the SystemMailboxes where we get the following event:

Event 7043 MSExchangeIS

The mailbox GUID of an external system mailbox ('Mailbox - SystemMailbox{03daeb05-03fd-48ee-b028-14f760f457c7}') does not match the information in the Active Directory for the mailbox. The existing GUID ('7598b1d8-b2ed-4f12-a193-9b2802f7c8fd: /o=Taco John's/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=SystemMailbox{03daeb05-03fd-48ee-b028-14f760f457c7}') has been replaced with the expected GUID ('dd6c102b-8b19-40eb-9656-d7182904b894: /o=Taco John's/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=SystemMailbox{03daeb05-03fd-48ee-b028-14f760f457c7}').

We also have several different AD Objects in the Microsoft Exchange System Objects Container:
AD Exchange System Objects Container
While we see these other objects in the AD Users Container:
AD Users Exchange System Mailboxes
How do we go about fixing these conflicts/errors?  I've tried recreating the schema with setup /prepareAD which doesn't seem to fix the problem, however, it did allow me to mount a newly created database that wouldn't mount before running that command.

I am hesitant to delete any of the accounts as I attempted to fix this in the past and it ended up making one of our databases un-mountable which is definitely not ideal.

Thank you in advance and please let me know if you need further information/details.
TacoJohns-ITAsked:
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AmitIT ArchitectCommented:
did you migrated from earlier version of exchange server or it was a fresh install.
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TacoJohns-ITAuthor Commented:
The initial install was done on Exchange 2003 I believe, however, that was long before my time.  I migrated the system from Exchange 2007 to a new Exchange 2010 server last summer.
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AmitIT ArchitectCommented:
Something similar discuss here
http://social.technet.microsoft.com/Forums/exchange/en-US/8f019672-d525-43da-98d9-776fa0df94f6/event-7043?forum=exchange2010

Which says to delete them, as they no more required.
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TacoJohns-ITAuthor Commented:
I've tried that before and ended up making one of the databases un-mountable...is there a safe way to tell which ones are not needed, I've looked at the output from "Get-Mailbox -arbitration" would I be safe to delete ones not referenced in there or are there other places to check which system mailboxes are in use?
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AmitIT ArchitectCommented:
You just ignore it. It won't cause any issue. In large Exchange environment this is very common issue.
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