Virtually all passwords are common terms from the game
When you have a box or an envelope in inventory, open
it right away. Also, unless the box or envelope disappears
from your inventory, it still has some goodies in it!
If there's crucial information in a fax, written down
on a scrap of paper, or in a letter, or on a post-it note,
write it down for yourself somewhere. You may want to be
able to remind yourself later.