Seems to give more flexibility to claim anything.
An items "significance" as well as age, metal, size or numbers.
It makes sense really, if we find something that has a special significance then you can understand why they would want to hold on to it, although I think the term "treasure" needs replacing. Maybe SHOs - Special Historical Objects. That could cover anything and could have classifications underneath in sub sections.
We're always being encourage to declare our finds and "show" them to FLOs - so that way, anything nice becomes a SHO-er.