What (the heck) is it?

The piece is made of stiff black plastic-- like that used to make dominoes-- and is approximately 3/8" thick. The surface of the piece is filled with a rectangular array of uniformly spaced holes that are visually labeled with a white checkerboard pattern. Each square on the checkerboard covers four holes and is roughly 1 cm square (we did not take a ruler to it). The rows and columns of holes-- not checkers-- are labeled. The rows are numbered from 0 to 33, increasing from top to bottom. The columns are numbered from 24 through 47, going right to left. The row labels appear on both the left and right sides, and the column labels are also repeated on both sides. That, combined with the coarser size of the checker pattern would seem to indicate that its usage requires either (1) rapidly identifying the numeric coordinates of a given hole or (2) rapidly finding a given hole from given numeric coordinates.

So what is it? (This time we really don't know, so your best guesses, hints, and spoilers are welcome!)

Update 9/24/07:
Still no definitive answer. A few more details noted upon a closer look: The holes are clear through the plastic, with no electrical parts, connectors, or contacts inside-- it's just a sheet of holey plastic. The checkerboard pattern and numbering are repeated on the back side of the panel.