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All three artifacts are not mandated, and they are optional. You can have all of three artifacts or either of them in one toolbox. And only those artifcats will be deployed.
You can install the custom toolbox by following the steps in Installing custom toolbox.
Structure of Toolbox
Toolbox artifacts should be placed in the as shown in the below structure
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According to the above configuration, there will be one tab and the title of that tab will be 'My Jasper Tab Title' and associated jasper file is 'My_Jasper.jrxml'. The datasource configuration is provided by 'datasource.configuration' property.
Packing Toolbox
After including all required artifacts as described above in a directory, finally you need to make it as .zip file and change the extension to .tbox.
The name of the .tbox is taken as the name of toolbox. Further more now you are ready to install your toolbox, and you can install the toolbox by following the steps in Installing custom toolbox.