Hi ZoTaR,
Yes, try contacting TerraHertz! That's a good idea. I second the motion.

I am a collector of old technical works. I'd be very happy to receive and care for these, and can pay the shipping. I'm also a member of the Australian Computer Museum Society. These works would be accessible to others in that Society, though would remain in my care.
Statement of objectives: I don't consider scanning and document presentation technology of today to be adequate for long term historical preservation. So it's absolutely necessary to preserve the original paper works. Even if scanning _could_ produce data files from which it was possible to manufacture physical copies indistinguishable from the originals (ie reproducing the feel and complete visual quality) the originals still have historical authenticity and trustability, which anything digital cannot.
'Libraries' these days tend to hrow out old technical works. And too many people think they can scan or photograph old docs ("it's good enough, you can read it, right?") then throw out the original. If they didn't already destroy it to feed the pages through an auto-scanner.) Short sighted barbarians... So much is being lost.
Shipping.
Where in Singapore are you? Near a major airport by any chance? Because if you can pack them in boxes and take to the freight office of any airline that flies to Sydney, eg Quantas, I can pick them up at the airport here.
Or you could use DHL to ship them.
How many boxes like in your photo would there be?
The hand written notes - what kind of quantity of these? If it's relatively small they are a nice historical inclusion in the set. About the bulk of one of those Journals?
Otoh, if there are boxes of them I'd probably pass on those.
Packing.
They'd need to be packed fairly well to avoid damage. Be aware boxes get dropped, tumbled, and sometimes punctured. Books survive quite well if packed flat, and protected around the sides with something resilient like styro foam sheet. All excess space in the box has to be filled with something, so the books can't move around in transport. Keep the fillers lightweight.
The box in your photo is probably strong enough, but for shipping it's not allowed to have openings like the carry holes there. You can close the flaps and tape over them.
Don't ship or store books in the orientation you have them there. It strains the spine, which can break.
Store and pack them flat, always.
It's also a good idea with such rare old works, to include a moisture barrier in case the box gets wet. Ideally, individually plastic bag each book. But if that's too much trouble, then a large plastic liner bag in the box is better than nothing.
Thanks for the PM. I might not have noticed the thread as I'm mostly too busy to read eevblog much these days.
When you have an idea of the number of boxes, size and weight, we can discuss freight methods and cost.
Edit to add: Oh and before packing, if you have decided on a shipping carrier, it's a good idea to ask about their box size and weight limits, also price increments. For instance if you go over their 'two person lift' threshold it has consequences.
May be better to have several smaller boxes that are easy to lift. Ship them as a numbered set 'Box 1 of 4' etc.
Speak with them and ask.
Kind regards,
Guy