Not all laptops look the same. My dell is grey with a white surround. But identifying your laptop is a good idea.

I engrave my name and phone number on the outside of the case and also on the keyboard surround. This (hopefully) deters thieves and makes it more likely that the machine can be recovered if lost. I also engrave the machine's ID number so I can quote it when asked by tech support. Since I never sell my laptops, any reduction in sale value is not an issue.

Explosive residue?? Are they mad? How many million machines will they have to dust to find some, and when they do, it probably came from a mine site. Surely they have better things to waste our tax on.