I didn't notice that, but I did notice a ton of people with practice problem solution manuals, which from reading the list of stuff we were allowed to bring in NJ, I thought was a big no no.
To me, if you don't know the material enough to work the problems out on your own, you are starting out from a disadvantage in the first place, so if people want to bring that stuff, and it's allowed, fine by me... but I couldn't imagine spending half the test flipping through 10 million binder pages.
I was able to get by with the PE reference book, a Cameron Hydraulic data book, an HVAC text book, and the 4 ASHRAE manuals. Didn't even need two of the ASHRAE books.