The yellowing is likely false aging as well, either that or using real parts from a yellow SNES but it sucks that this is fake.
Is there actual evidence of a fake now? The yellowing on the bottom is quite common in old plastic consumer devices and if they just reused the base but spun up a few tops with a matching screw arrangement and without all the fire retardants that tend to see yellowing happen (all well within reason for a prototype/test lab type arrangement), then that is common enough in prototyping, especially 90's prototyping.














