I suggest that Dilmun seals should be included in the Indus Script Corpora based on the following argument:
Qal`at al-Bahrain – Ancient Harbour and Capital of Dilmun 26°14′01″N 50°31′14″E Excavation 520 at Qal’at al-Bahrain, reported Dilmun seals made using the same Indus seal technology. This indicates seaward movement of seafaring merchants and artisans from Sarasvati Civilition into Qal'at. https://www.academia.edu/36750743/Dilmun-Meluhhan_Relations_Revisited_in_Light_of_Observations_on_Early_Dilmun_Seal_Production_during_the_City_IIa-c_Period_c._2050-1800_BC_
Abstract. This contribution brings together information on several aspects of early seal ownership and seal production during theCity IIa-c period. It shows that seals were common objects and that ownership was not restricted to specific professionsor socio-economic segments of society. Seals were made in small workshops, alongside other items of jewellery andpersonal ornaments. They were carved from exotic raw materials that had to be imported. Softstone was the mostcommon and there is mounting evidence that suggests a specific type of steatite was preferred by the ancient seal-cutters. Surface treatments were applied in order to achieve the desired effect of a shiny white seal. This dictated the preference for dolomitic steatite and limited the scope of possible alternative materials. It is suggested that the pyrotechniques that were employed and the choices that were made by the ancient seal-cutters form a technological style highly reminiscent of that of the Indus Civilization, including some of the important ideological associations. Thisapproach and its tentative outcomes bolster the commonly accepted theory of a westward transmission of Harappan sealing technology, which has so far been based primarily on iconographic analysis.
Details at Itihāsa. Indus Script metalwork hypertexts of trading civilization of Failaka, Saar & Barbar Temple, Bahrain.Dilmun revisited: excavations at Saar, Bahrain -- Harriet Crawford (1997) Excavations at Barbar Temple -- Hojlund, Flemming et al (2005)
https://tinyurl.com/ycozar7v
After Figure 4. Eleven seals from the workshop area in Excavation 520 at Qal’at al-Bahrain (Kjærum 1994:figs.1726, 1729, 1731 – 2, 1734 – 5, 1737, 1739, 1741 – 43) in Eric Olijdam, 2017 (opcit.).