The reason is, there was no sign of forced entry.
This lady had only recently moved to the new home and when she moved in, had new locks installed.
She took her car to the local mechanic, who she had been going to for many years, to get it serviced. As normal, she pitched the keys to the mechanic and went to wait in the waiting room.
Little did she know, but the mechanic had recently taken on a new employee, laborer to do general duties in the workshop. The mechanic shop thought they were doing a good thing by giving an unemployed person a job.
According to the police report, they searched this persons house on suspiscion because the mechanic shop is the first and only place the lady went to, where she was without her keys. The good investigative work by the police, found her property in this persons possession after contacting the mechanic and getting a list of the people that worked there the day the lady brought the car in.
Being without her key for a short time, the burglar had opportunity to get the number off the key, see the customers records, obtain her address and get a key made to the code number. Then they obviously robbed the home.
I recently changed the locks to restricted copy proof keys, that prevent any similar scene from happing again.
Do you know and trust everyone who may have access to your keys?