7. Include a list of files that you need recovered.
Even if you prefer the whole drive, occasionally this is not possible. Try to prioritize your list of files, and indicate which are the most important. Data recovery companies nearly always ask for this information at some point; it's best to get it out of the way.
8. Get a tracking number.
Sometimes, shipping companies will lose or delay shipment on drives. Although this is rare, it's a good idea to watch the progress of your shipment, and contact the data recovery company you shipped to to ensure that your package was delivered in good condition.
With safety of your data in mind, you can ensure that your data recovery costs are as low as possible, and that your information is back in your hands quickly.