Antiques Roadshow embarked on a first-ever effort for the show in Denver last Saturday: Appraisers examined pieces of government-held unclaimed jewelry. The Colorado State Treasurer’s unclaimed property division contains some $450 million of objects or cash. There’s even a Great Colorado Payback website for residents to search. As with all of the tour stops, the action was taped for consideration as part of Antiques Roadshow’s 2010 season. At one recent appraisal session, Roadshow scored its first million-dollar appraisal.