Ok since you are on HN let me tell you a hack that I learnt here.
Order him a pizza from a local pizza place near your friend's house with your credit card. Get the pizza guy on the phone when he is at your friend's address. This way you will at least know if he is at home and maybe talk to him if he is there. You can even make the pizza guy ask the neighbours or leave a note on his door. Dont forget to tip the pizza guy through paypal or something.
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Ok since you are on HN let me tell you a hack that I learnt here.
Order him a pizza from a local pizza place near your friend's house with your credit card. Get the pizza guy on the phone when he is at your friend's address. This way you will at least know if he is at home and maybe talk to him if he is there. You can even make the pizza guy ask the neighbours or leave a note on his door. Dont forget to tip the pizza guy through paypal or something.