If you are using root explorer and not just some other file manager, it means that the rom has somehow deleted your efs folder. On my phone I can see the following files.
/.android
/imei
.nv2.bak
.nv_data.bak
nv_data.bin
.imei
.nv2.bak.md5
.nv_data.bak.md5
nv_data.bin.md5
.nv_state
Lethal: Make a backup of your efs folder, and then delete it. Sometimes the phone can regenerate the efs folder with the correct files. If you are lucky this just might work.
If you made your nandroid backup after you applied OCLF, it means that you are going to have to apply the lagfix first before you can restore it. Something to do with the format of the /system folder. If the nandroid backup was a full backup, the efs folder will be in there.