The matter of meteorite fall is mysterious and complex. Even the Spy Bureau sent special personnel to investigate, but probably due to a greeting from Lord Jingnan, the Spy Bureau merely sent people over to inquire if the event happened, asked, and then left without mentioning checking the meteorite or taking anything away.
This saved a lot of trouble for the Earl's Mansion because the meteorite had long been "gutted" by Xue Three. Creating a fake one to settle the matter wouldn't actually be difficult, given that meteorites seem mysterious, but their composition is fairly common. But as they say, having one less piece of trouble is indeed less trouble.
Another reason is that the former emperor believed in mystical arts, but after the Yan Emperor ascended the throne, this atmosphere was cleansed. Therefore, subordinates, including the Spy Bureau, might report but certainly won't foolishly send the meteorite as an omen to Yanjing.
