Dear Riverkid,
This is a fill-in question from China's university admission examination some years ago. The given answer is 'should', not 'can'. If I had taken the exam, I would have chosen 'can' at first glance. I have been puzzled for all these years about it. All the explanations that I read from China's teaching materials didn't convince me.
Me neither, so far, Joham. 
I've read in your posts the word 'deontic' several times. It's not in my dictionaries and I don't understand 'Is #1 a deontic 'can'?'. But I was taught "can" mustn't be used for the future if it refers to ability.
I was hoping you could help me further. Thank you so much.
First; could you expand on "But I was taught "can" mustn't be used for the future if it refers to ability" and provide some examples that illustrate this, Joham?
Second; deontic modal use refers to the social uses of modals [advice, prohibition,necessity, permission, etc] as opposed to epistemic modal use which refers to modals used to denote level of certainty, probability, possibility, etc. Is this clear?
Third;
A: When can I come and fetch my photos?
B: They can be ready by tomorrow noon.
'can' is used to describe ability, correct? That also extends to 'capability', as in,
We can produce that here = We have the ability/capability to produce that here.
I know that your idea of using 'can' as in the dialogue, part B, is idiomatic English, so it remains only what type of modal use it represents.
They can be ready by tomorrow noon.
It's not an epistemic use of 'can' because that would sound too tentative when B obviously means "They will be ready by tomorrow noon."
I believe that it illustrates 'can' as capability, a deontic use of modal 'can'.
"They can be ready by tomorrow noon" states,
I know that we have the capability, [the necessary staff and the machines to do the job] to have them ready by tomorrow noon.