Thanks to Arturo Chávez (@x_pogo64_x) for sharing all these materials to the Archivo! There are truly rare CDs such as the Aurora Negra (1990s band from the OC), the cassette demos by Las 15 Letras & Los Olvidados.
In addition, there's The Juntos por Chiapas album that featured Mexican and Argentinian bands unreleased tracks and interviews. This was a Latin American solidarity effort that has yet to be discussed more.
Plus, some cool ephemera from San José Lodo y Asfalto, Kinky, Jaguares, Café Tacuba, and an early La Muerte sticker.
Will be digitizing this and sharing as single posts soon.
Thanks so much again for sharing all these material!