I was on reddit recently and a user said they had a complete set of the Zimbabwe notes. I was curious so I asked them what they were considering complete.
It turned out that the poster had a full set of the 27-note 3rd dollar banknotes series - but nothing beyond that.
For a long time there, BanknoteWorld - while they were publishing those books - as well as other merchants seemed to define "complete" to include the 2nd dollar bearer checks and agro checks in addition to the 3rd dollar bank notes - about 59 notes and checks.
Another vender I deal with often encourages people to try to build a complete set from P-1 to P-98, but this still excludes the newer bond notes (P-99 and P-100) and includes the 1st dollar traveler's checks and Standard Chartered bearer checks P-13 through P-20 and P-24 through P-27), when seemingly few others do.
I think ultimately I'll have to arrive at my own definition of complete for this set / project, which may end up being whenever I just decide I'm satisfied or I'm done.