Boxberger is dealing with a strain in his right flexor muscle and remains without a timetable for his return, Roger Mooney of the Tampa Bay Times reports.
Contrary to what was reported earlier, Boxberger is actually being held back because of a right flexor strain and not the lat strain that had bothered him earlier in camp. He resumed a throwing program Wednesday, though he remains without a firm timetable for return. Given that the 28-year-old will need time to build up his arm, it seems likely he'll be out until at least sometime in May.