An electronics cabinet includes front, rear and side walls, wherein the rear wall includes first and second removable panels, the first and second removable panels being mounted to the rear wall with securing fasteners and further includes a security system for preventing removal of the first and second removable panels. The security system includes: an assembly that overlies a securing fastener of the first panel and a securing fastener of the second panel; and a locking device engaging the assembly, the locking device configured to move between locked and unlocked conditions, wherein in the locked condition the locking device prevents removal of the assembly from the first and second rear panels, and in the unlocked condition the locking device permits the removal of the assembly from the first and second rear panels.