It's cool to think that first contact between two space-faring civilizations could potentially involve a mutual exchange of detailed historical imagery that neither civilization could have captured on their own.
Indeed, though it’s probably likely in the history of the universe this has never happened, as what are the odds of two distant civilizations separated by many light years meeting and both offering historial imagery to each other? The chance to capture relevant images will have passed if they do not specifically plan for it.
Probably unlikely, yeah. It would have to be the result of several lucky and serendipitous events, I'm sure. The idea of seeing into the past seems so other-worldly though, it's hard not to dream :-)