single rolls(especially handrolls).....and loosies produce more silver per coins searched than machine rolled boxes...but you can't rule boxes out because when they produce it is usually big..at least that has been my experience so far..like sneak said ....pick em all up even the singles ...you just never know...besides most tellers love to get rid of them as they have to count them everyday and there isn't much turn around so they are usually stuck with them for a long time....if you take all they have off thier hands you may have just made a friend who might hold onto all the halves and save them for you...