Starting in the late seventies, Simutek (a hardware and software dealer) released a series of numbered software "Packages" for the TRS-80. The programs in each Package came on a single 5.25" floppy disk.
The bundles did not solely feature games - some of the Simutek Packages offered utility programs. The reason for the gaps in the VideoGameGeek entries (i.e. no listings for Package Five or Six) is that the missing collections did not include any game programs.