During manfacturing, Nintendo would inscribe the boards in gold. At the top of the SNES/Super Famicom boards, you should be able to clearly see "SHVC" in gold inscribed onto the mainboard.
All of the below are legitimate boards. You'll need to open your SNES carts in order to compare yours to the below. If your board is similar, you'll probably have a legit cart.
If you own a cart that isn't in this list, message the moderators to get it added.
|Cart||Australian Code||Canadian Code||European Code||French Code||Japanese Code||Scandivanian Code||US Code||PCB Type|
|Mario's Early Years: Fun With Letters||N/A||N/A||N/A||N/A||N/A||N/A||SNS-AMYE-USA||SHVC-1J0N-10|
|Mario's Early Years: Fun With Numbers||N/A||N/A||N/A||N/A||N/A||N/A||SNS-YR-USA||SHVC-1J0N-10|
|Mario's Early Years: Preschool Fun||N/A||N/A||N/A||N/A||N/A||N/A||SNS-AMEE-USA||SHVC-1J0N-10|
|Mario is Missing (SHVC1A0N10)||N/A||N/A||N/A||N/A||N/A||N/A||SNS-MU-USA||SHVC-1A0N-10|
|Mario is Missing (SHVC1A0N20)||SNSP-MU-AUS||N/A||N/A||N/A||N/A||N/A||N/A||SHVC-1A0N-20|
|Mario Paint (SHVC1A5B04)||SNSP-MP-AUS||N/A||N/A||SNSP-MP-FAH||N/A||SNSP-MP-SCN||N/A||SHVC-1A5B-04|
|Mario Paint (SHVC1A5M20)||N/A||N/A||N/A||N/A||SHVC-MP||N/A||N/A||SHVC-1A5M-20|
|Mario's Time Machine (SHVC1A0N20)||SNSP-8M-AUS||N/A||N/A||N/A||N/A||N/A||SNS-8M-USA||SHVC-1A0N-20|
|Mario's Time Machine (Prototype)||N/A||N/A||N/A||N/A||N/A||N/A||SNS-8M-USA||SHVC-2P3B-01|
Credit to SNESCentral for the information to create the depository.