Multiple realities
(covers information from several alternate timelines)

Shuttle 2 was a Kelvin-type shuttlecraft that was in service to Starfleet, assigned to the USS Kelvin in 2233.

In the alternate reality, this shuttle was the second-to-last shuttle out of the Kelvin's shuttlebay prior to the vessel's destruction. She was targeted by one of the Narada's torpedoes, but saved when a phaser blast from the Starfleet vessel destroyed the torpedo. (Star Trek)

While the shuttle behind shuttle 37 wasn't identifiable by its markings at the time, it was the shuttle just behind shuttle 37, and there was another shuttle behind it, which would make it shuttle 2 based on the order the shuttles exited the Kelvin's shuttlebay.
A starboard profile of this ship, identified as a medical transport shuttlecraft, was in the Star Trek Encyclopedia (4th ed., vol. 2, p. 277).