(I am not sure that all these steps are needed but it worked for me) The next image you take will be DSC0002 etc. Then after you have taken an image (DSC0001), reformat the card again and set the menu back to series. Now you can simply reset a card to DSC0001 by formatting the SD Card and changing the menu from 'series' to 'reset'. So when you put a brand new card into the camera, it will also start at DSC1000 because the menu is set to 'series' Since you have used an SD card that previously held Sony images, the count starts after the last image number on the card (even if you reformatted it). I also erased and formated another SD card and its showing DSC2328, so either I must use a brand new card to check the count or it really has this many clicks so far. I've tried OOC jpeg/raw and no luck at all, only thing is jpeg will process but shows zero shutter count and i've fired atleast 50 so far.

The tools.science website doesn't work for the a7RII - it's not a supported camera yet. Anyone able to get or EXIF data reader to show shutter count for the A7Rii.

Exiftool shutter count sony a7ii