3 shots for hep B is standard...i am not aware of it expiring or needing a "booster"...just give your clinic a call and ask. they would probably just run an antibody titre to verify.
here is a note from a quick google search:
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Studies have shown that infants, children and adults who have responded to a three-dose hepatitis B immunization series are protected from hepatitis B for at least 15 years even if they lose detectable antibodies over time. Long-term protection relies on the immunological memory, which allows a protective anamnestic antibody response after exposure to HBV.
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