This is very odd considering that even their own media owned up to the fact that at least ten Indian soldiers were captured last year. I guess the photo revealed that it was only the tip of the iceburg.
It does answer the question of why China released most of the captives almost immediately though. There is no way that Chinese logistics could support this many prisoners.
The thing is MUCH more than 10 Indians were captured in June and who knows which other incidents.
The Indian has 10 units of "good" and pretend to have 100 and shouts about having 100. China has 100 and will keep quiet about it unless it is required for whatever strategic reason and maybe only release evidence of 10.
This is why China has WZ-8 flying around in active missions for years and then show it when it is required but it's not even the tip of the iceberg. And Indian meanwhile has nothing but powerpoint slides and has the shamelessness to say China's 2012 flying prototype of FC-31 is copied from their AMCA powerpoint slides. It's beyond shameless and pathetic.