Nikon offered some trunks for transporting heavy lenses.

Early trunks did not have a number, code or whatever marking.

Large RF lenses could be ordered/stored in non-painted wooden cases.

During the 1980's the blanc aluminum trunks were replaced by yellow painted aluminum trunks,

followed by modern gray flight cases around 2007.

In the CT-303 all Nikkors in the 300mm/2.8 group will fit in this trunk. In the little box teleconverters etc. can be stored.

A modern trunk (CT-405) or flight case

The trunks listed below as far as known by the author.

Trunk code for lens material
     
CT-101 Z 58mm/0.95 flight case, gray
     
CT-300 300mm/2  aluminum, gray
CT-301 N.N.  
CT-302 Nikkor 300mm/2.8 AI/S aluminum, yellow
CT-303 Nikkor 300mm/2.8 AF  idem
CT-304 Nikkor 300mm/2.8 AF-I idem 
CT-305 Nikkor 300mm/2.8 AF-S  idem 
CT-401 Nikkor 400 mm/2.8 AF  idem
CT-402 Nikkor 400mm/2.8 AF-S  idem 
CT-403  N.N.  
CT-404 Nikkor 400mm/2.8 AF-S G VR  idem 
CT-405 Nikkor 400mm/2.8 AF-S FL  gray flight case 
CT-406 Nikkor 400mm/2.8 AF-S FL  gray flight case 
CT-501 Nikkor 500mm/4 AF aluminum, yellow 
CT-502 Nikkor 500mm/4  idem
CT-503  N.N.  
CT-504 Nikkor 500mm/4  idem 
CT-505 Nikkor 500mm/4 PF gray flight case
CT-600 Nikkor 400mm/5.6 aluminum, yellow
CT-601 Nikkor 600mm/4 AI/S idem
CT-602 Nikkor 600mm/4 ED MF  idem 
CT-603 Nikkor 600/5.6 AI/S idem 
CT-604 Nikkor 600mm/4 AF-I idem 
CT-605 Nikkor 600mm/4 AF-S  idem 
CT-606 Nikkor 600mm/4 AF-S II idem 
CT-607 Nikkor 600mm/4 G VR  idem 
CT-608 Nikkor 600mm/4 ED FL  idem 
CT-801 Nikkor 800mm/5.6 idem 
CT-1203 Nikkor 800mm/8; Nikkor 1200mm/11 aluminum, gray
CT-1217 Zoom-Nikkor 1200-1700/5.6-8 aluminum, yellow
CT-F1 various longer VR-lenses aluminum, gray
     
CZ-1860 Zoom-Nikkor 180-600mm/8 aluminum, gray
CZ-3612 Zoom-Nikkor 360-1200mm/11  idem