Hey BD, I saw this in the most recent Handyman Magazine and thought of you! Maybe I shouldn't post the Picture. The article talked about packing fragile items and using spray foam.
Idea- spray foam in the bottom half of the box.
Wrap your item in cling wrap.
Place a layer of cling wrap over the top of the the first layer of spray foam.
Add your wrapped item on top of the plastic wrap.
Cover that with a second layer of wrap.
Add your second layer of foam.
Cut off the extra foam so you can close the box.
The two layers of wrap will allow separation of the two pieces of foam.