My parents are in the process of going through their first eviction process in NJ. The tenant has not answered any calls, visits to the apartment, and is ignoring certified mail. The sheriff is scheduled to remove her and her unapproved guests from the apartment next week, however as we believe the tenant has no where to go, they are concerned she may break a window to get back in or retaliate by breaking windows and causing more damage to the apartment. 

Has anyone ever temporarily boarded their windows to prevent the tenant from intruding after being removed? 

I'm not sure what type of insurance policy they have, but would insurance policy's cover damage after the tenant has been removed since it would be trespassing?

Hopefully they have landlord insurance and not just homeowners on this property.  Read the policy to see what's covered.  I would expect vandalism to be covered, but who knows.

@Jon Holdman - Thanks, What's the difference between landlord insurance and regular homeowners? 

Well, at the highest level landlord insurance will pay a claim on a rented property and homeowners won't.

Homeowner's insurance is for a property the owner occupies as a primary residence.  Landlord insurance is for rental properties.  It accounts for the higher risk associated with a rental property.  It usually has a high liability limit and covers lost rent.