I believe this information is stored in the EFS Partition. Did you back that up? I know that in TWRP, there is an option to backup the EFS Partition, but I believe you have to manually check the box. If it is EFS partition that is missing, I think it is unique to your device so you can't just restore any EFS Partition. Of course, I'm not 100% sure on this. As stated, check XDA for any further help. Hope this helps.