Apparently this is stumping everyone I ask.
The 5340e has an entry under the blue applications button called "People." Apparently it is some kind of personal 'address book' type of storage, on the actual phone itself, that isn't visible on the 3300 back end.
Ours have 50 slots for name/number stores. I've never used it, so I don't know all the details exactly, but from what I understand, folks can add 'to people' from history as well.
Thanks!
-dg