Not something I would reccomend.
e.g. you lie, tell them fully enclosed garage, a week, a month, 4 months time - whatever, you make a claim. eg someone has backed into your car, or damaged your car somehow in this basement car park, you lodge a claim, tell them it happened.
What are you going to explain to them? You have a duty of disclosure.....
You have just paid your early premium for nothing. Cash in their hands!