I make origami boxes and then pack them out with a thick layer of bubble wrap at the bottom, then tissue paper, the item and then more tissue paper, seems to work ok with minimal settling of contents during transit. You could cut card inserts to fit just inside the boxes to go over the cotton fill and then punch small holes in them for earring posts and hooks, a layer of scrunched tissue paper over the top should hold it all in place. You could try googling to find the foam inserts but it might be better to go back to your original supplier so that you know the inserts will fit the boxes you have.
Sasha
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