How many BIONICLE store display tubes were created?
As it turns out, a Rahkshi store display tube does exist and was recently re-discovered.

The following display tubes are known to exist.

G1

2002 Rahkshi Panrahk



2003 Tahu Nuva



2005 Hordika Vakama



2005 Visorak Keelerak



2006 Inika Jaller



2006 Piraka Hakann



2006 Piraka Vezok



2007 Barraki Kalmah



2007 Mahri Nuparu



2008 Mistaka Lewa



2008 Mistaka Lewa and Tanma



2008 Mistaka Tahu



2009 Glatorian Gresh



2009 Glatorian Mata Nui



2009 Stars Tahu



G2

2015 Tahu



Others

2001 Onua Sculpture

(Technically a display tube, but a brick sculpture rather than the set.)