Tilly's shuttle

In the mirror universe, Tilly's shuttle was an unnamed Terran Empire auxiliary craft, a Disco-type shuttlecraft in Imperial Starfleet service in the 2250s decade, assigned to the starship. 

History
This shuttle was aboard the ISS Discovery when it inadvertently traded place with the spore drive-jumping USS Discovery around December 2256/early 2257. 

The ISS Discovery and a fleet of Klingon birds-of-prey materialized at Pahvo in 2410. 

When Captain $𝜇$ and her Terran reinforcements established a base on Phavo, Tilly's shuttle was landed near the Pahvan transmitter. When Tilly escaped and the Terrans were defeated by Alpha Quadrant Alliance forces led by Chief Scientist Samet, Tilly's shuttle was left behind on the surface. 

Background

 * "Starship Terran Empire" was written on its side in capital letters.
 * In the official trailer for the Mirror of Discovery update, Captain Tilly can be seen talking with Samets in front of the shuttle. This scene does not occur in the missions.