So I have a question for people who are involved in
museums, and similar
roles - how intense should I be about keeping things just as they were?
There are a few things to consider. For example:
1. How rare/valuable is the item?
2. What else might be inside the package?
3. Will opening it cause any damage?
4. Can you store it in a suitable way after opening?
A DEC product guide isn't very rare.
One time, my group had an unopened box from a famous computer company.
We decided to open it. It contained a far more precious artifact than we
expected. Had we not opened it, we wouldn't have known what we had!
You can always put the guide into a Zip-Lock bag or whatever.
So I'd say open it.