You may need your vaccination record to show that you are fully immunized. Some venues in some cities are qreuiring proof of immunization to gain entrance. Your employer may want to see documentation.
The Department of Public Health has several options for getting a copy of your immunization record, depending on where you were immunized. Learn more here: https://www.mass.gov/info-details/covid-19-vaccination-locations#requesting-a-copy-of-your-vaccination-record-
Please contact my office if we can be helpful to your efforts to obtain a copy of your vaccination record.