I haven't had this problem in previous playthroughs, but in this playthrough Shawn refuses to open the envelope with the magic key in it. I returend the letter opener at the beginning. Can he really not open envelopes without a letter opener?

Sorry, I just saw your post a month later. I've never heard of this happening, but I did see something similar when I restored a game and tried to open the envelope. It turned out I had already opened it (before saving the game) and had the key.

Were you able to get this to work? You definitely do *not* need the letter opener.

I had to restore an earlier save from before Terk sent me to look for the envelope. That worked though.