I have both a 1DsIII and a 1DIII. I have tried several different apps to determine shutter count and all I tried seem to only work with newer camera bodies. Does anyone know how I can determine shutter count?

By the way, I have them both on ebay for sell. The 1Ds is in good condition and the 1D is in very good condition.

https://www.ebay.com/itm/373915479117
https://www.ebay.com/itm/373915490406

I now have a 1Dx and love it

Mark