Well the neighbor just gave me a call. It was ant killer, Spectracide® Fire Ant Killer Plus Preventer Bait Once & Done!. I did an internet search on the active ingrediant Indoxacarb and just saw some aweful things so I decided to play it safe and call the poison control hotline, it stinks that it costs so much to call but I suppose it's small price to pay for peice of mind.
The good news is that the control center said that if Vash shows symptoms they should be mild (one or two episodes of vomiting or diareah), after which there shouldn't be any long term side effects.
I just hope Vash understands he just blew this months toy budget on a snack.