Update to the injured Capybara.
I can't confirm if it is the same individual I found months ago, since I couldn't get closer to see if he had any scars. But at least now I can tell that there are more than one living in the park. Some passerby commented that there were six of them including a pup, they might be scattered around the park, hidden between the plants, but these are the only two I could find.
They aren't moving around much, but that might be because of the winter, it is quite cold, especially during mornings, and, from what I learned from this sub, they are less active in cold weather.
They both seem fine, I hope I can find the rest of the herd if it is actually there.