Whatever the cause, in a long term scenario, the things that will be good to trade are the rare things and those rare things that really have either use or are considered real luxuries. Of course, in order to have value, someone must want to buy the luxury.

I think 1, 2 and 3 on your list have both, value and use, and to some extent can be luxuries. But, they may not be rare. If people in your area can readily get salt, for instance by letting salt water evaporate or by mining, then it is worth less. If you can always find shell casings and sulfur, then the ammunition may be worth less in your area. It's going to be diffierent for every area.