I'm so paranoid that when I turn my machine on in the morning, I watch and make sure the memory tested okay. Many, many people don't know what's inside that thing. They turn it on and it works. I could come and put a modem in or take something out and they'd never know. Check the slots periodically.
Agents have a tough time investigating a cold trail.
Let's do some things that will help the agent when he shows up to investigate. Here's a real low-tech way to always know if your machine has been opened. Seal the edges and check periodically to see if the decals have been broken. No, because you probably already have them. You can't take those off without destroying them.