Weight, hollowness, heat, sounds, textures, seams and moving parts became became more apparent. The ambidextrous design of the mouse was also apparent through touch when holding the mouse.
The shallow engraved labels and small blue light to indicate that the mouse was on were no longer legible, but still palpable through textures or heat.
Inferences about internal components could be made more readily without vision (e.g. the weight of batteries, the clicking of switches, the heat of wired components, etc.)