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I think the experiment was still in progress when they took it away, since they observed his reactions to this. Later they might have given him the device.

That reminds me of the experiment where someone lived with upside down goggles[1]. Just like with babies trying to understand what they see, his brain had to adapt to everything and he had to relearn to perform the actions.

I wonder how it was once he took them off.

[1] https://www.youtube.com/watch?v=-kohUpQwZt8

I recall reading quite a while back about these ethical considerations - I'm pretty sure the ethics have been better taken into account with subsequent experiments.