Boston and Almagia

Boston's Museum of Fine Art has the following objects listed as linked to Edoardo Almagià (and noted back in 2010):

• Roman imperial marble portrait statue. Inv. 1991.534. "By 1991: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022; purchased by MFA from Edoardo Almagià, May 22, 1991".
• Italian impasto kantharos. Inv. 1995.820. "By 1993: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022 (said to have been purchased in Basel); February 15, 1995: purchased by Jonathan Kagan and Sallie Fried from Edoardo Almagià; gift of Jonathan Kagan and Sallie Fried to MFA, accessioned January 24, 1996".
• Italian impasto cup, Lazio. Inv. 1995.821. "By 1993: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022 (said to have been purchased in Basel); February 15, 1995: purchased by Jonathan Kagan and Sallie Fried from Edoardo Almagià; gift of Jonathan Kagan and Sallie Fried to MFA, accessioned January 24, 1996".
• Italian impasto cup, Lazio. Inv. 1995.822. "By 1993: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022 (said to have been purchased in Basel); February 15, 1995: purchased by Jonathan Kagan and Sallie Fried from Edoardo Almagià; gift of Jonathan Kagan and Sallie Fried to MFA, accessioned January 24, 1996".
• Italian impasto cup, Lazio. Inv. 1995.823. "By 1993: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022 (said to have been purchased in Basel); February 15, 1995: purchased by Jonathan Kagan and Sallie Fried from Edoardo Almagià; gift of Jonathan Kagan and Sallie Fried to MFA, accessioned January 24, 1996".
• Italian impasto cup, Lazio. Inv. 1995.824. "By 1993: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022 (said to have been purchased in Basel); February 15, 1995: purchased by Jonathan Kagan and Sallie Fried from Edoardo Almagià; gift of Jonathan Kagan and Sallie Fried to MFA, accessioned January 24, 1996".
• Italian impasto cup, Lazio. Inv. 1995.825. "By 1993: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022 (said to have been purchased in Basel); February 15, 1995: purchased by Jonathan Kagan and Sallie Fried from Edoardo Almagià; gift of Jonathan Kagan and Sallie Fried to MFA, accessioned January 24, 1996".
• Italian impasto cup, Lazio. Inv. 1995.826. "By 1993: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022 (said to have been purchased in Basel); February 15, 1995: purchased by Jonathan Kagan and Sallie Fried from Edoardo Almagià; gift of Jonathan Kagan and Sallie Fried to MFA, accessioned January 24, 1996".
• Italian impasto pyxis, Lazio, Inv. 1995.827a-b. "By 1993: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022 (said to have been purchased in Basel); February 15, 1995: purchased by Jonathan Kagan and Sallie Fried from Edoardo Almagià; gift of Jonathan Kagan and Sallie Fried to MFA, accessioned January 24, 1996".
• Italian impasto amphora, Lazio. Inv. 1995.828. "By 1993: with Edoardo Almagià, 136 East 56th Street, New York, NY 10022 (said to have been purchased in Basel); February 15, 1995: purchased by Jonathan Kagan and Sallie Fried from Edoardo Almagià; gift of Jonathan Kagan and Sallie Fried to MFA, accessioned January 24, 1996".

What is the identity of the Basel source for these nine pieces of Italian impasto ware that appear to have been derived from Lazio?