My case it is quantities and maths because son Jas will open/crack all the eggs open or open all the juices to drink. He has to get everything out and won't recognise it is same object - sweets too he has been like this - makes himself sick
Lock up items he has access to. Does he have pica? Too much of anything is dangerous.
I suggest you bring him to the doctor and test if he has short term memory loss. That is a sign that not only he is autistic, but he has a worse condition if he can't recognize simple objects.