Certain skeletons drop kunark/velious items
 

a barbed bone skeleton drops warbone chips, a Kunark item
a skeletal monk drops Crystallized Sulfur, a Velious item

Warbone Chips dropped as early as July 1999.

https://web.archive.org/web/20021116...&pg=1&sortby=1

Crystallized Sulfur dropped prior to Velious, I believe. It could use more research.