The Duty Curator in each curatorial section changes regularly on a rotational basis.
As I think SVN images still fall within the copyright period, they can only be contributed/accepted into the AWM collection from the original photographer, their heirs, or a person who has been legally assigned copyright.
And the AWM don't simply archive images: there is an ownership/granting of rights process in various forms. Check the copyright indicator on images for various 'types'.
Also, taking images into the collection and maintaining them is an expensive process, so curators tend to be pretty picky about what they can accept.
Mike C