Try to reset the furby, this furby has a reset button at the bottom. Hold down the tongue in beak, and use a paperclip to reset it.
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This picture is from the 2012 furby, but its still applies to furby 2016 as they both have reset buttons. If you’ve already down this, then this means the actual eyelid is detached. Here are some video/sites that might help
Here’s a video dissemble that might help: https://youtu.be/JlUDiag7i6c
Here’s another video dissemble that might help:https://youtu.be/4OTkOYPPKDs
Here’s a site that might help: https://fccid.io/RS4-B6083A/Internal-Photos/Internal-Photos-3031176
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