Maple and Birch are notoriously hard to tell apart, especially when the veneer is smooth, without knots and is a fine grade like the Camco/Tama shells. I just took a real close look at my clear finish Keller shell Maple snare alongside the Camco/Tama. The two veneers are almost identical in texture. So, maybe the advertising is right. Are these Keller shells?
Good idea to check with a cabinet maker for verification. I do know the Camco/Tamas exhibit nice warm tones like Maple should :)
kellyj