They've got the warrant; it was a reasonable warrant, in a standard form, that he could reasonably have anticipated. The FBI have the right to execute it. (If you're arguing that this particular warrant shouldn't have been issued then that's a separate issue). It's Levinson's fault and his problem, not the government's, that Levinson specifically designed his site such that he couldn't execute this kind of ordinary, reasonable warrant without failing to provide the service his customers were paying him for.
