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I'm really sorry but you cannot deduct the cost of these questions from his deposit. There is no basis to do so in law.
He is perfectly entitled to attend with a police officer to prevent a breach of the peace. You will not be arrested unless you commit any offences which I'm sure you will not do.
Since he is clearly trying to collect his belongings I'm afraid I cannot agree he has abandoned them. He is right to the extent that if you damage them you will be committing criminal damage and that will lead to an arrest and if you remove them that would be theft.
Can I clarify anything for you?