Yuyuko isn't to be underestimated!
...I'd have Sakuya say something, but, honestly, coming here was Kilga's thing and I don't really have any ideas on where to take the conversation. I wouldn't say the conversation went well enough to reasonably bring up hunting for old or historical items right now. tl;dr is that Yuyuko letting the print end up in our possession uncontested was her form of apology, which was a rather fitting "gesture" for both involved parties (allowing Remilia to revel victoriously), even if it may not exactly equal out an assassination attempt (not that many things are grandiose enough for that in the first place)