No, that is the actual number of items. If there were leprechauns who didn't carry anything, then those were just extra leprechauns which don't affect the item count.
The leprechauns in Ilshenar carried the Catskills Green Beer and the Catskills Irish Stout. The Cernunnos' and Kasaven's versions were distributed by the leprechaun who was running around the Britannian cities.