Look at the back of cupboards, especially cupbaords you do not always use.
Behind the microwave
At the bottom of the laundry basket
In his gym bag, if he has one.
If you have any beds with drawers in the base, that's always a good hiding place.
Does he have a shed or out house, could be there.
Thing is though, if you do find it what will happen? It might just change his hiding place. I doubt it will stop him drinking
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