Do you have anything written showing your intention

was to renew the lease to May 10,2010? Such as email, letter, etc.? If so, you can use that as proof.

The other part is that if you move out of town, and do not write them with your new address, they will not be able to locate you even if they want to sue you.

One other thing is, they might have your SSN. If you get a judgement, they can get a collection in your credit report.