CFast card download issue

Hi, I am trying to download footage from a C300 mark ii shot on a Sandisk 256GB Extreme Pro Cfast card.

The card says that it has 59.85 GB on it, but all that shows at the finder level is the INDEX.MIF of the clips, no actual clips! When I put the card back in the camera it says no clips.

The card was formatted prior to use.

Any ideas?

Something is a little weird. the date created is showing 1969 and modified in 1979 which I assume that is not correct. I would suggest running some data recovery software on the card to see if the data can be recovered.