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That is the reason you have an X-ray to vet electronics before allowing them into secure areas (with potentially secret sound and generic em-waves (from 200nm to 300000km aka 300Mm)). If you don't have that already, you don't have that much physical security...

Would the magnets in the motor interfere significantly with radio transmissions? Not that it would preclude devices being housed inside either way, just introduce complications.

You can surely have a big case around a small motor (either smaller radius or smaller length) and fill the rest with components

Even if not the motor, they could likely fit some components in the USB jack itself, before it reaches the pins/board