For those interested, here are some other restaurants:
Hung Tao Yee Foo won ton soup
Capital Restaurant
Ly Luck
Sun Kwong
Kirin
Eight Immortals
Riverside Seafood Restaurant
Andy’s Chinese Restaurant
Jade Dragon
Yan Yan Seafood
Hang Ah Tea Room
Sam’s Chinese Kitchen - Pacifica
Golden Wok - “minced duck yee foo won ton”
King Wah Daly City - Roast Duck Yee Foo - I’m not sure if this one still exists
I find it interesting that this dish is almost exclusively SF Chinatown (with some spread to Oakland and down to Daly City) but I can’t find it anywhere in Milpitas, Sunnyvale, Fremont, San Jose…anywhere south of Daly City.