In the tweet by @ArchiveInternal, the images depict the back of an iPhone 11 Pro from two viewpoints, with one angled upwards from the base while the other is a flat top-down view. The second image highlight the manufacturing error.
The Apple logo usually sits in the center of the back panel. In this case, the logo is off-center to the right and slightly angled anticlockwise. This is probably caused by the panel wasn’t seated properly in a machine before the logo was applied to the device. There is not much information aside from the pictures. This ‘1 in 100 million’ chance now raised the price of the unit to $2,700. It is still unclear how the device managed to get through Apple’s rigorous quality assurance processes. The anonymous account posted images of prototype devices in the past, and though extremely rare, mistakes do occasionally slip through into consumer’s hands.
Source: News18, Apple Insider, @ArchiveInternal