thanks hillbilly.
A set of 4 keys is required to remove the unit.
I have a set of 4, but (unfortunately) they are the Chinese ones and they don't work (same as the two keys in your link)
Gen-u-whine OEM keys are numbered IIRC and you need all 4 to remove the unit. (I have the part number...was fearful of purchasing OEM because someone told me that they cost a fortune. Apparently not according to liquidforce)
I'll speak to my local stealer on Wednesday when the 'treg goes in for a warranty fix.