Very very little to go on. But what is reported is that they had to do a recovery in steps. And as the result of the steps could only recover the memory module containers. And we see that the containers are not really deformed. And have examples of failure mechanisms of earlier deep water crashes.
My impression, no more than that, is that at the time of the crash the containers came loose partial or whole from their mounting on the ' tray' of the recorders. And that they were partially connected and covered to and by other debris. Other debris being the mounting frame of the recorders and surrounding structure. Which required cutting that loose and away. Which may have caused part of the seemingly superficial scraping on the containers. This might suggest a fast entry.
If the containers had remained attached, you would expect more denting.