Lex spent a decent amount of time taking out his loot and setting it up in his new museum. He would then use his 'Room creation' feature to alter each room according to the needs of each specific item. For example, he needed a room which would not allow energy to leak for all the items emitting the heated spiritual energy.
For the energy sources of all the ships he needed a room that would block radiation as well as maintain a sterile environment.
More than the energy sources, Lex was particularly careful when setting down the various artillery shells he had picked up, as he no longer even had skin to lose! At the same time, he questioned Pel thoroughly over their use, and discovered that most of these were extremely useful against Earth immortals, and he had even picked up one that could be used against Heaven Immortals!