CCP Rattati, in a recent Dev Blog for “Global PLEX Market” said (@00:25:49) they can now have “infinite” number of item ID’s.
So, technically every stack we split/re-stack, already creates a unique “container” ID which contains specific quantity of a specific item type. It could work for a stack of itemized ISK (Type ID: 52996 https://everef.net/types/52996), to make them anonymous, or disowned, for a while.
It could work for special information items.