Another option is you can have them delete the old key from the CAS memory. The metal key will still work in the key hole but they won't be able to start the car or unlock with the remote.
You can then also do the keyhole delete on the driver's door, but there will still be the trunk keyhole.
AW/Terra | ZSP | ZPP | ZCW | iDrive | CA
Mods: BC BR | OEM Blacklines | M-tech rear | custom dual exhaust | M3 steering wheel | BMW SSK | ZHP shift knob | BMW Performance rep spoiler
Varrstoen ES1 19x9.5+20 Front, 19x11+25 rear