Likely it's fine. Is it an under saddle piezo pickup? If they drilled a whole in the guitar and it appears sound, I wouldn't worry. It's probably a fun addition. the Yairi isn't a super high end guitar, but it's no slouch either.
So long as it doesn't have any rattles, and it feels solid I would enjoy it and not worry. A Yairi with a pickup is a lot cooler than a Cordoba.
Ideally if it was a piezo, that it was an under saddle transducer, where somebody put it in a good spot. The advantage is no battery compartment or annoying preamp to deal with.
A good transducer placed in the right spot, can sound nice plugged in. Plus you can always use a phaser or flanger pedal if you get bored