Look no further for meaning with that ID photo, dear. That was found by someone on the train, and—-as tradition dictates for any lost documentation or identification—-posted in the nearest public area where the person has the most chance finding it, if they come back.
I do agree, though, a lost photo's identity would always be a mystery. Until we find out the truth, it is the next best thing to be known for.
So, should we call him Rosebud?
*Girl peeking to check if the next MRT train is on its way.