Need a report of first contact with ME DC for computers

Need a report of first contact with ME DC for computers

I'd like to get a simple report for the first contact of a PC to ME DC, but not the one under AD Reports, since most of our computers are in a Workgroup in the field.  Hope this is an easy one. 

Basically, we have the ME DC Agent baked into our images which doesn't contact the server until the PC name changes.  Works like a charm.  What I need is a way to determine when a machine first appeared in SOM, as this report will give us when each PC was first deployed in the company.

Thanks!

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