Sri Lankan jackal (subspecies) is listed as present in this Mammal List.

This report from the Bangladesh Sundarbans lists the Jackal among the mammals

Spotted in 2019 in Hainich NP

This report from the Bangladesh Sundarbans lists the Jackal among the mammals..... they won't follow the frontier, so they will be in the Indian Sundarbans too

See Table 1 list of fauna in this document

(Wikipedia)

"Among animals found in the region are: (...) jackals" (Nomination file, p. 35)

"Flagship species include (...) Jackal" (OUV)

"The Sri Lankan jackal (Canis aureus naria), also known as the Southern Indian jackal is a subspecies of golden jackal native to southern India and Sri Lanka." (wiki) - this Jackal is listed as present in the Nomination file of the Central Highlands

Nomination file has 6 references to golden jackal

Huai Kha Khaeng (source)

(source)

(Wikipedia)

Golden jackal (Canis aureus) in Mae Nam Phachi WS (Nomination file, p. 16)

(Wiki)

Great Himalayan NP nom file lists the jackal among its mammals...in apps 2a and 12

See this study

In Kobuleti Protected Areas (wiki)

"The Sri Lankan jackal (Canis aureus naria), also known as the Southern Indian jackal is a subspecies of golden jackal... native to southern India and Sri Lanka. On the Asian mainland, the Sri Lankan jackal occurs in the whole southern part of the Indian peninsula, from Thana near Bombay in the northwest southwards through the Western Ghats," (wiki)

(Wikipedia)

At the Hammar Marshes (wiki)