Should be fine.
Thais are known to be extra careful when toxins are used.
"Aluminum phosphide is used as a fumigant to protect stored grain from insects and rodents. In the presence of moisture, aluminum phosphide releases phosphine, which is highly toxic. The fatality rate was 59% among 195 patients admitted to a hospital in Northwest India. The fatal dose was 1.5 g, and the predominant clinical feature was hypotension (Singh et al., 1996). Two children and 29 of 31 crew members aboard a grain freighter became acutely ill after inhaling phosphine originating from aluminum phosphide. One of the children died (Wilson et al., 1980)."