stacy greer got something she wanted.iece of the plane that her father died on, which she now wears around her neck. do you think you'll ever get an answer as to what happened to your dad? >> i hope. >> does it solve the mystery? maybe it does, maybe it doesn't. at least what we should be able to say is that we have a thing now that might have an answer, we need to be able to check the box that either yes or no it does or doesn't. >> reporter: a mystery sitting in a cardboard box on a kitsch encounter. for "nightline" in boston i'm david kerley. >>> next, mark wahlberg taking us back to his hometown, site of the boston marathon bombing. dos on my car insurance with geico. i should take a closer look at geico... geico has a long history of great savings and great service. over seventy-five years. wait. seventy-five years? that is great. speaking of great, check out these hot riffs. you like smash mouth? uh, yeah i have an early day tomorrow so... wait. almost there. goodnight, bruce. gotta tune the "a." (humming) take a cl