The 16th-century silver object had been taken from a church in Toro in 1890

The museum is selling paintings by Picasso, Pollock, Léger and De Chirico, among others, at Christie's next month

Trustees will look at whether the museum should “upgrade” works by living artists

Contemporary art museums say their collections are undervalued and at risk

The museum is to deaccession duplicates from its collection

Museum of Modern Art’s relations with former trustee's relations were “warm but distant”