Acquire a vending machine key. If you have lost your key you can acquire a new one through the vending machine distributor through which the machine was originally purchased. A list of distributors can be found online. Contact the distributor and tell them that you need a replacement vending machine key. They will ask you to provide the model information and will ask you about a 4 digit number located on the tubular lock assembly. This number corresponds to the key configuration. The distributor will send you the key in the mail.