But thinking about this for 45 seconds gets you to these possibilities:
1. He doesn't really know anything, he's just excited and talking without choosing his words carefully.
2. He's guilty and he knows that things were taken, but he's lying about that.
3. He's guilty and he thinks he knows that nothing was taken, so he's telling the truth.
Now for the other 45 seconds. If he's guilty and has just committed a bloody murder and staged a break-in and cleaned up everything but Rudy's DNA, he does not call the police in the first place. He and Amanda are off enjoying themselves in Guibbio (or whatever that place is called).
So yes. Suspicious for a moment, then easily dismissed by rational people.