I just read the latest article on Blackbag. I must say , I've seen this same situation several times before.
Mostely its an older lady , complaining someone (usually a drug addicted neighbour) can get in their appartement. There is no damadge to the lock and their is never anything stolen. I then sell them a new lock , or 1 of our technitians goes there to change the lock. 2 days later they are back , claiming the same person got in again.
I've had 1 customer who bought 1 pfaffenhain cylinder , a 3KS and then wanted a code lock. All of this in about 1 week.
Has anyone else had any customers like this ?