Some questions you might want to ask

What is a safe deposit box?
What can I store in a safe deposit box?
Are there any items that are prohibited?
What do I need to open an account?
Can I allow other people to access my box?
How much does the service cost?
What are your opening hours?
Where are you located?
Do I have to give prior notice before accessing my safe deposit box?
Are my items insured in case of damage or theft?
Are there any cancellation charges if I decide to terminate my rental?
Do any third parties have the right to access my box?
What happens if I lose my keys or smart-cards?