[Red Herring]

Sorry to be a bit downbeat about this but if he's going to park it in the same place every day then if it is in the least bit desirable it's likely to be targeted at some point. There is nothing short of an armed guard that will stop that happening. If he is going to put something on it that will alert him if it is disturbed is he within a couple of minutes of it at all times, because that is roughly how long he will have and then he needs to be confident he can deal with what he finds...... Stopping someone from wanting it is so much easier than stopping them from having it so commuting is one activity where beaten up old hacks excel!