All Pencils of Mine Are Sugar-plums

The blog's name comes from one of Lewis Carroll's syllogisms (oh how I love solving them on a rainy day..)
here it is:
(1) There are no pencils of mine in this box;
(2) No sugar-plums of mine are cigars;
(3) The whole of my property, that is not in this box, consists of cigars.

The clue to which is : No pencils of mine are sugar-plums

Sorry, Mr Carroll, but my pencils are definitely sugar-plums!