A company that will sell you the missing puzzle piece! 
https://www.jigsawdoctor.com/index.htm
I would think the picture on the box would be required, but only the surrounding pieces are required.
The last puzzle that I was proud to complete?
Probably the Duck Tales the Movie puzzle 28 years ago.

https://www.jigsawdoctor.com/index.htm
I would think the picture on the box would be required, but only the surrounding pieces are required.
The last puzzle that I was proud to complete?
Probably the Duck Tales the Movie puzzle 28 years ago.
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