The collections departments of a number of universities that usually dig there may have some or know some. Southern Methodist University here in Dallas does frequent digs in Egypt, and they may have a few lurking around.

In working at a museum, I've discovered that often what you're told they have is only what they put on display. The curators may have bunches of things elsewhere (we don't have anywhere near the space to display every single fossil we've got (or even some of the very nice ones) simply because there's so darn many.

It's like Bast amulets... there's bazillions of genuine ones dating from about 600 BC out there.

So check to see which universities dig in Egypt frequently (anybody with a department of Oriental studies or Egyptology) and check with them.