Maybe I'm being paranoid but it seems risky to bring the remaining four manuscripts together in one place.
If security is properly managed, risk should be acceptable, in the sense that only the most unlikely umanageable disasters would remain, and the impacts of the worst of these would be such that few if any of us would miss the Magna Cartas for a long, long time.
If security is properly managed. I sure hope they've done thorough TRAs (threat-risk assessments) with independent review.
In my home town this happened: http://www.spiegel.de/international/germany/history-in-ruins...
Thanks to bureaucracy and politics, it's still not clear who is officially to blame, although it's mind-numbingly obvious that it's a mix of really stupid decisions in the planning stages ("let's run the subway line right underneath an extremely important building through an area that almost entirely consists of gravel and water") and corruption at some level of the building companies (which seems to be SOP for public building projects in Germany).
Let's just say that most parties involved are pretty happy the investigation hasn't really been going anywhere over the past five years, which is entirely coincidentally enough time to allow all politicians that might be blamed to transition to greener pastures (communal elections in the Land are held every five years).