In the summer of 1976, a violent home invasion robbery took place in Shrewsbury, Mass., netting  furs, rugs, silverware—and three significant works of art.

Works by seminal Realist artist Gustave Courbet and American impressionist Childe Hassam were recovered in 2007 when a Rhode Island art dealer notified the FBI that they had been offered to him. The man who brought them in said they came from his brother, an antiques dealer, and he did not know the paintings were stolen.

Heirs of the homeowner's estate are offering the works at Sotheby’s auctions this May.

Courbet’s, “The Shore of Lake Geneva,” will be sold at Sotheby's 19th Century European Art sale on May 4 and is expected to go for between $ 200,000-$300,000.  Later in the month, Hassam’s “In the Sun” will go on the block; it is estimated at $1.5 to $2.5 million.

The third stolen artwork, William Hamilton's "Lady as Shepherdess," is not part of the sale.

To date, no one has been arrested for the crime.