Ask Amy: Sleuth wants to report adultery to friend

She should narrow down her list. She can send individual emails, or a group email and blind copy everyone, saying something like: “Please forgive the awkwardness, but I am trying to sort through the wedding gifts and packages we’ve received. One package which was shipped has no identification. If you sent a gift and your gift hasn’t been acknowledged, please let me know. We’d love to solve the first mystery of our marriage.”