According to Acura's parts diagrams, there is a difference between the styrofoam trunk floor mold and tools for the '91, and the ones for the '05. (I'm not sure what year it changed.) Click on the illustration below for the list of part numbers. It looks like all the tools (including the spanner/wrench that's included for '05 but not '91) are present in Jason's photo above, except maybe the "emergency tire cover". However, there are some tools that were not included from the factory, but which you can order; see
this topic for details.
One other thing appears to be going on. In '91, they used a different trunk floor mold in EIM (European import model) NSXs, which came with additional tools (pliers, etc), than they did in the USIM models. I suspect that the trunk floor mold for '05 is the same for all markets, so there are open spaces when all the tools are present in the USIM cars, spaces that are used for the additional tools that are still supplied in other markets...? You can read about the Euro tool kit in
this topic.
1991 NSX trunk floor mold and tools:
2005 NSX trunk floor mold and tools: