Boston Marathon official Finishers’ Certificates and Racers’ Record Books are typically produced in May and June, and then mailed out in July. Delivery can take up to several weeks to be delivered. Please contact the registration office by sending an email with your current mailing address to registration@baa.org in early September if you do not receive either of these items. Boston Marathon Awards I was a participant in the Boston Marathon. When should I expect to receive my Finishers' Certificate and Racers’ Record Book in the mail?