When it comes to antiquities, especially Egyptian, fake artifacts have been produced for centuries -- so the odds are always against an artifact being genuine. It may be easier to identify a fake than to authenticate a real artifact. An antiquities dealer or an antiquities online group will be able to tell you more. Here are some resources:

http://www.thefakebusters.com/scarabs/Orig%20fake%20menu%20Egyptian%20scarabs.htm

http://www.collector-antiquities.com/real-or-fake/fake-egyptian/fake-scarabs.html