I think I've figured out the trick to my glitch.
If you pick up the figurines from the center table first and place some of them back on the table, and then open the coffin, the only items inside are the items that you can use your synergy on. However, if you open the coffin first, there's the synergy items as well as two more figurines that you will need.
In the first example, the coffin won't close because you haven't picked up all the items yet (which is not surprising, since the two figurines are not there.) The coffin close-up will only close when you've taken everything from it.
If you still want that savegame, Weldon, can you tell me the default location where the savegames are stored, and what they are called, because I can't seem to find them.