When renting a storage box, you need to have a few things on your mind.
If you are a new customer you need to know how many projects has the company carried out since it started the business?
If you are hiring the company for long term dealership, then you need to be sure that the company is legalized by the government authorities to carry on such operations, this to avoid disappointments in future.
Hire a moving and storage company within your area.
Document every single paper you both sign with the company officials to avoid disappointments in the future.
Visit the official websites of the companies you are interested in and look at a few things like reviews and ratings from their previous customers.
Ask friends, family and job colleagues to refer you to a moving and storage company that they have experience on.