Apply a box shaped UVW map to the box. In the UVW map properties on the right hand bar, enter in even values for U, V and W values (say, 100,100,100). Make the stars material visible in the viewport (the blue checkered box thing in the material editor, for the bitmap in question). Then go into the sub-object mode of the UVW modifier and use the scale tool to adjust it to how you like. You should be able to see it update in the viewport.
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