I just received a reply from the Australian War Memorial saying thank you, but no thank you, they couldn't accept digital copies of photos for consideration. Unfortunately I'm not the holder of the original photos in my family otherwise I would have happily donated them so now I'll have to tactfully suggest to the owner they consider donating them.
Rumour has it that this relative may have 'disposed' of the originals and only kept digital copies! Some people have no sense of history
So a warning - if family members are going to have a 'cleanout' (and you have forewarning) but they're not prepared to give the photos to anyone else, suggest they make a donation to an appropriate institution or museum. EB