I can just see an OC in the Supreme Court. The OC, “but your Honour no one has established it is common property and we have no idea where the common property is”.
And this would only happen if someone was disputing it. Simple logic. How much information do you require the members of your committee to have to hand at any given time? All they need to know is how to access it, if and when required.
I really can’t see the problem here, unless all records of the building have disappeared from every location where they might be held.