What sort of drugs. It's unlikely that criminal drug dealers would accidentally sell a fridge full of prohibited drugs. If that's what you received, contact the police - and quickly, before the local mafia discover their loss and come looking for it!
If it's "ordinary" pharmaceutical drugs this is still serious, but not criminal. Surely the obvious thing is to ask the seller whether they realise it was still full of drugs when they sold it? Otherwise, you could ask your local dispensing pharmacist for advice on how safely dispose of them.
