Since there was only a superficial scratch with no bleeding and you had already taken rabies booster doses recently (May 10 & 13), the risk is very low. However, as the puppy cannot now be observed for the full 10 days and has gone missing, it would be safer to consult a nearby doctor/anti-rabies clinic. Depending on your previous vaccination history, they may advise booster doses as per current rabies prophylaxis guidelines.
Next Steps
Visit an anti-rabies clinic or physician as soon as possible with details of your previous vaccination record for assessment and advice regarding booster vaccination.
Health Tips
Rabies is almost always preventable if managed appropriately after exposure. Whenever the biting/scratching animal cannot be observed for 10 days, medical evaluation is recommended rather than waiting further.