Could undiscovered Mars-sized objects exist in the Kuiper Belt?

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Could one exist that size that we don't know about?
 

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It would have to be *really* far away to have avoided detection by now.
 
IIRC, the 'Planet X' hunt covered much of the plane of the ecliptic, but the new IR telescopes cover a wider field with greater sensitivity: If there is anything, it is waaay out and/or steeply inclined.

So, one or more could show up in the next couple of years.

In a related hunt, IMHO, there's still a chance of finding super-cool 'Brown Dwarf' stars within a parsec...
 

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