Toxicity of Mercury (II) Iodide and dicopper (I) tetraiodomercurate (II)
Following the @Nilay Ghosh recommendation, I found an SDS sheet for $\ce{Cu2[HgI4]}$ and there is SDS for $\ce{HgI2}$.
For $\ce{Cu2[HgI4]}$:

Acute toxicity estimate Oral (Expert judgment): 5,1 mg/kg
Acute toxicity estimate Inhalation (Expert judgment) 4 h: 0,051 mg/l
Acute toxicity estimate Dermal (Expert judgment): 5,1 mg/kg

For $\ce{HgI2}$:

LD50 oral rat: 18 mg/kg
Acute toxicity estimate Inhalation (Expert judgment) 4 h: 0,051 mg/l
Acute toxicity estimate Dermal (Expert judgment): 5,1 mg/kg