Restore IMEI with absolute NO backup?

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http://forum.xda-developers.com – I've got a friend who got a new Captivate from the US. And he flashed CM10 right after getting it, without making a backup of the efs folder. Now, the efs partition is completely empty, and of course it says "Unknown baseband, unknown imei", etc". I've looked around, but all the imei restore methods seem to require at least one efs file. However in this case we have none. So, is there any way to restore the efs/imei? Maybe mounting it to the pc and running a file restoration software (might sound desperate, but we are). Also, I have another captivate (this one is mine) wit (HowTos)