Having finished with bedbugs, Elle is now dealing with thieves. As the fashion title moved into its new offices in the Time-Life Building at 1271 Sixth Ave., an e-mail was sent this week warning employees to watch their belongings. “We’re sorry to report that we have experienced several incidences of theft over the last few days. We are making sure we have locks available tomorrow . . . In the meantime, we urge you all to lock up your laptops or take them home with you until we have a way to secure them.”