I'm stuck in the warehouse trying to find a way to see into the locker. All the walkthroughs say I'm supposed to use a sonograph, but I don't have it; it was in either Anna's or Ed's inventory, which are no longer accessible. Does this mean I'm permanently stuck now?

Just for completion, in case anyone finds this thread in the future looking for the same answer: all the previous inventory items that are not on Ray's or Bennet's inventories already can be found on Ed's appartment.