Often the boxed text is written with assumptions about how the characters encounter the area. All too many times, my players have somehow managed to enter areas in an odd manner, making some of the boxed text seem out of place.
Static area descriptions would be OK, as in the basic description of the area. NPC's & Monsters ought to have their own little boxed text descriptions to detail them. However, leave any reference to interactions between the players & npc's/environment as it never seems to work out correctly.... players enter the wrong door, npc's who are listed as running off to warn others are intercepted by the pc's unexpectantly, certain spell effects make changes (light, darkness, clairvoyance, etc).
There are so many things that players do that make boxed text irrelevant. I make a point of perusing the boxed text & room info, then paraphrasing only the actual visual/auditory/smells etc. I purposefully leave out the scripted actions.