Digital BW, The Print

Hello list, 
 I have a matted, framed, dry mounted print that is
going to be auctioned off by a gallery in NYC.  Since
the print was a mono-print the gallery said it must be
signed to be auctioned at the reserve price they set. 

  Here's the thing..  They already have the framed
print.  They got it from another gallery that was
showing it.  I'm in Dallas. I suggested that I open it
up and sign it when I go up to NYC for the opening
reception. 
  My question is, where can I sign it?  There is some
white space around the image on the paper, but the mat
board covers it.  Anyone sign prints, then cover the
signature with a mat?  What about signing the back of
the board? (I usually leave space for this when
matting, but I didn't think this one would end up
getting auctioned!)

Your help and suggestions are greatly appreciated!
Thanks, 
Daniel Perez
Dallas, TX

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