Welcome to the site, Annie (I'm also late.....oops). I think it's wonderful that you rescued this beautiful boy from a terrible fate - congratulations on your new family member :)He is beautiful and very regal looking! However ...... Egyptian Maus have naturally occurring spots, and are never only one color. I'm sorry if someone passed on incorrect information to you. Here is a link to the TICA's (The International Cat Association) description and breed standard for the Egyptian Mau:
Your beautiful boy looks happy and content, as all cats deserve to be
Hats off to you for giving him a loving home!