Thanks to everyone for the very useful suggestions. Should get me most of the way there. Am surprised, though, that there's not a dedicated note type to search by, since Evernote clearly treats business cards (in terms of formatting) very differently than every other type of card.
In Evernote (I'm using the Mac version), is there special syntax for searching for all business cards? Obviously I can search for "intitle:"business card"", but, in case I've edited the title of some business cards to not have "business card" in them, is there search grammar I can use to retrieve all notes that were created with Evernote's business-card scanner? Thanks for the help! -Alan