Hi Steve,
Were all the files deleted at once? Or have they been deleted over time?
When they have been deleted over time, some will have been overwritten and destroyed by the new data being recored to the device.
It may be that it is possible to get some more files back.
The best thing to do would be to take an image of the card, Zip it, and then upload it to us so that we can take a look. If you want to do this, contact
support@getdata.com for instructions.