Early last June, the Padres made the opening move of the 2016 trade season, shipping James Shields to the White Sox in a pre-draft exchange. It wound up being the first of six deals before the non-waiver deadline, each transaction going toward what has become a massive rebuilding project. More than a year later, the objective remains the same, but this deadline figures to be more reserved. The Padres no longer have onerous contracts to shed. Their most obvious trade chip, left-hander Brad Hand, was claimed off waivers 15 months ago. The other options consist of more relievers and starting pitchers on one-year deals. Sources say about 15 teams have expressed at least casual interest in Hand, but as the Padres opened the second half Friday, no agreement — involving Hand or anyone else — appeared imminent. “Last year, we obviously started earlier in terms of moving pieces,” General Manager A.J. Preller said. “I think it’s hard to predict exactly how the timeframe’s going to play out.” In addition to Hand, relievers Brandon Maurer, Ryan Buchter, Jose Torres, Craig Stammen and starters Trevor Cahill, Clayton Richard and Jhoulys Chacin have drawn varying levels of interest. Yangervis Solarte had attracted attention, but the second baseman is on the disabled list and may not return in time for opposing teams to accurately gauge his value.