When Samus discovers what seems to be an easy-to-reach Missile Tank and Energy Tank on the BSL Station, she is met with a big surprise! The X are not limited to mimicking organic creatures, and have the ability to change into intelligence-made technology and even inorganic statues.
The Energy Tank Mimic is found in Sector 5 and the Missile Container is found in Sector 6. After the creatures are defeated, real versions of these collectible items are able to be found in the same rooms.