But you would have something to place it based on other events. The day after there would have been the major news story that a child had disappeared. There would have been the added detail that they were abducted from a place where you'd been calling.
I couldn't tell you what I was doing last week but I can tell you exactly what I was doing the day I heard princess Diana was dead. More personally - I could tell you exactly where I was and what I was doing when I heard a student at the University my daughter attended had gone missing. Both were significant events one was both significant and it's location resonated with me.
Good points
For arguments sake, lets assume the call was nothing to do with the crime. It was just a call from outside PdL on an unrelated matter.
1. Would the caller, 13 years later, remember what the number was, and thus realise they made the call?
2. Would the caller know where CB was? I make calls all the time to people and don't bother to ask them if they are out, at home, or wherever
3. Would the caller remember, 13 years later, that they called CB before the crime?
I mean I can much more believe that had they called him after the crime, and they knew he lived local, they would ask him about it and that would stick. But a call before hand - i wonder if anyone is going to remember that
Like you, I can remember discussing Diana with 2 people - and even some specific comments - but I can't tell you who i spoke to the day before