Barbey, I agree with Bill, you should sit down with your agent and their principal or managing broker.
The only way an agent can enter your home is through the lock box and the Supra Lock Box system records the time and day and agent information for each time the lock box is opened. The only reason that I am telling you this is because it seems to be a concern the way you wrote your question.
I am so sorry that have had this added stress to selling your home. Hopefully home owners' insurance company will help.
I am contacting a lawyer this morning to see if Supra isn't liable for making defective lockboxes that the general public are using under the premis they safe. I am tired of my listings being broken into.