@mwichary here's a keyboard from my youth to challenge you:pic.twitter.com/PuqLPHYHkZ
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(What happened to that Q!?)
Speaking from experience, those keys are atop a membrane and only held in by the snap-shut case. My old Casio (RIP) now lives in a ziploc bag full of keys. I'll bet the model in this photo came apart at some point and was put back together.
Wow. The _exact_ photo: http://old-organizers.com/Images/Casio/SF4600B_2.jpg …
... I guess I should have dug out my old hardware and taken a picture of that 
I wonder if reverse image search would work for your obfuscated photo!
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