VEVOR Metal Locker for Employees, 9 Doors Storage Cabinet with Card Slot, Gray Steel Employee Lockers with Keys, 66lbs Loading Capacity office Storage Lockers for Home, School, Office, Gym

Yes, these are able to be mounted to the wall.

The product description states it is made of cold-rolled steel and there is no information about rusting. However, customers generally appreciate its sturdiness.

Yes, according to the product description, each compartment can be locked individually with provided keys.

Security: What security measures does the cabinet have to prevent unauthorized access?

Based on the product information, it does not seem to explicitly mention if replacement keys are available for this metal locker cabinet. However, the key features section states that two keys are provided for each compartment along with two master keys for emergencies.