Do replacement logic boards have serial numbers?

Hello everyone. My MacBook is in the shop for a logic board replacement. I've read elsewhere on this board that when you receive a replacement logic board that the serial number is no longer available from the System Profiler? Is this accurate?
The reason I'm concerned is that my MacBook does not have that information available on the battery bay where it's supposed to be. According to Apple, there is supposed to be a gray sticker underneath the battery on the computer that shows the Ethernet ID and the serial number in addition to directions on how to change memory. My computer has never had this gray sticker.
I'm concerned because, if the above is true, there will be no way to identify my computer or to associate my AppleCare agreement with this particular machine.
Thanks.
Macbook (1 gig RAM; 120 gig HD); 20" iMac Core Duo (1 gig RAM; 250 gig HD)   Mac OS X (10.4.7)  

The boards themselves might, but when they're installed into your system it shows up blank in the about my mac preference pane. They can't write your SN into the board of a replacement. Checking under the battery you should be able to locate the SN. However you stated that this is missing.
I'd dig for your original receipt or box as the SN is one both of those items. Or you can try ringing apple or the store you bought it at and give your name, phone and email. They keep records of purchases at the stores on file, and also when registering. The mere fact that you've had it serviced means AppleCare should be able to provide that information to you by looking up your past case number. Make AppleCare add a note to your account that the sticker came up missing after the repair as to avoid issues with further service.
Nick

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