There it is, laid out in front of them.

Not all the pieces, of course, but most of them.

I don't know if I just helped, or destroyed the whole thing,

but the puzzle will always think itself puzzling because it's puzzled. 

Even if every piece seems to slide into place so perfectly.

Even if each and every mystery is solved, and everything is at last revealed,

it's in a puzzles nature to remain puzzling.

The puzzle might look solved, but there are still pieces missing.

Pieces I keep locked away so that no one can see them.

You might think it's complete, but if you were to open the vault

then you'd see just how few pieces you really had.

Probably.