The current emulator (port 8000) contains the oztivo IR slice. All those devices not in the original image are now added at guided setup. You can check the devices on the oztivo wiki (IR database).

When the new emualtor was setup our objective was to incorporate IR support for the various NZ specific set top boxes. I know we added support for motorola (which version?) and zenith boxes. The scripts came from the nztivo wiki.

If you have a different version of STB, you could take the codes you used, compare them to the IR database and incorporate into the database if you have some different version. The NZ system will grab the IR slice when it is updated.