UDLA. Frissell stipulated that upon his death, the Mexico City College (today UDLA) would have control of the collection and could not cede it to another institution. Another stipulation was that none of the pieces could be separated from the collection. A local newspaper reported that the museum building had been sold to José Murat Casab for 1.5 million pesos, against Frissell’s stipulation that the pieces and the building remain together. Sometime between 1995 and 2007, the museum's entire collection disappeared, along with paintings by León Zurita, the visitor log and a stamp collection. In early 2007, Samuel Quero Martínez, Rufino Aguilar Quero and Robert Luís Arreola, residents of Mitla, denounced the sacking of the museum and sale of its pieces, with the government of Oaxaca being suspected of having a role in the affair. Formal charges were filed in 2008. The dean of UDLA has denied the charges, and denies that the pieces were in the school's responsibility when they were found to be missing, but rather the property of INAH as "property of the nation". The dean claims that the university is not fit to manage such a museum and handed over the management of it to INAH. He also denies selling the building to José Murat Casab, but did make it available to the government of the state of Oaxaca with the possibility of sale. The museum remains closed, supposedly for remodeling. Discussions about the fate of the museum and its collection resurfaced in June 2009, when a group of Mitla residents petitioned INAH for the return of at least thirty percent of the museum's collection. Meanwhile, the formal investigation is ongoing, as the site is being used as a restaurant and inn. Mitla archeological site The main attraction is the ruins of the pre-Hispanic city of Mitla, which is best known for its buildings decorated with mosaics of small flat stones that fit together to create designs, especially fretwork. The Mitla is the second most visited archeological zone in the state of Oaxaca. Most of the town's economy is based on tourism to the site, being filled with restaurants, small hotels and shops selling handcrafts and mezcal. However, many residents here feel that the area is not promoted sufficiently by the government. Government sources say that the number of visitors coming to the site is increasing. Most visitors are Mexican nationals who come during the weekends