If the CB house was not broken into but entered by other means, my bet is on:
- a real estate agent with a multiple key to open the lock box
- another person who, through whatever means, had a key to the actual door lock
- a person who premeditated entry and had access to the house before MC went missing and "rigged" a window or door to not close all the way or lock, thereby providing access later.
It would be interesting to know if the CB house had an alarm system that needed a bypass code. Agents showing the home would get that code, as would contractors/subs who needed access for work, renters/tenants, prior owners...
Who else?
Granted, we don't even know if the house was entered, much less through what means.
Did I read that LE removed evidence from the CB "house?" Or did I hallucinate it? If so, would that imply INSIDE or AROUND the house?
As always, the above is MOO and wild speculation.