give a brief description of the burglary in the annexe.

I'm unsure which burglary you mean by real. The second burglar has more complications. The intruder had a skeleton key or a duplicate and did not have to force his way inside. Plus, he was scared off when he heard Mr. Van Daan. This is unfortunate for the residents of the annex, because that person may report them. It would be especially unfortunate if the burglar is one of the warehouse workers.