Interesting situation. Without the EXIF data, the photographs would be useless as evidence and the images would need to be unaltered (ie Photoshopped). The original date stamp would be required to tell exactly when the photo was taken. Any modifications (ie converting from RAW to Jpeg) could render the photo invalid.
The photos are valid as evidence unless and until they're challenged. I wouldn't be a bit surprised if the OP gets called anyway, to testify as to when he took the pics.