Yes, you can.
However, you must remember to add vehicle data before placing the box in the car.
You can have a Toll Box without vehicle data. If the box has been used previously, you must fill in the 'License Plate' field in the self-service. We recommend that you just write XXXX. Then you must remember to make the box inactive.
It is important that you remember to activate the box and add the correct license plate before using the box again. If you drive around with a box with incorrect vehicle data, you risk getting a fine.
You can certainly order blank Toll Boxes if you need to have boxes available for use when the need arises.
However, you must remember to add vehicle data and activate the box when it needs to be placed in the car. You can see here which vehicle data you need to add.