From Halopedia, the Halo wiki

Ms. Bjarne was the curator of the Museum of Humanity in 2610. At some point after the Human-Covenant War, she requested a hand-painted 1:53 scale replica of the Reach War Memorial at Hősök tere in New Alexandria on Reach. She did not receive this sculpture for some time due to delays with intersystem commerce. On January 15th, 2610, a former ONI agent sent the replica, along with a 600 series ONI security container - which contained Dr. Catherine Halsey's personal journal and a simulation of the actions of SPARTAN NOBLE Team during the Fall of Reach - to his cousin on Earth. The operative insisted that his cousin could give the container and its contents to Ms. Bjarne as a "curious relic", or turn it in to "someone at IN".[1]