Hi there and thank you for your question,
I will try to assist you with your legal question but please feel free to ask as many follow up questions as you like until you are 100% satisfied.
What you can do is (assuming that you are the sole beneficiary of the estate) is to lay a charge of theft at the police station against the brother. That might be enough to deter the brother from stealing anything else, and might actually make him return the stuff. Once the executor has been appointed, and you have been left the stuff, you could lay a charge of theft against the brother in your own name - as technically you would be the owner of the stuff.
Otherwise, the executors are empowered to recover the deceased's assets wherever they are and to distribute them in accordance with the will - so the fact that the brother has taken the assets won't mean much. He'll need to return them.
Otherwise, you'll need to lock up the property and don't let the brother in. In that way if he breaks in you'll be able to lay charges of trespassing against the brother and maybe also robbery.
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Good luck and best regards,