for what its worth, i sold my old iphone 4 on the XDA website to a guy who i presume was in india. he had me ship it to some 3rd party shipping company based out of JFK. i was skeptical about the strange address so i looked into it more. apparently is very common to have these 3rd party shippers do this for people operating out of india. i guess these people rent a stall or something at the airport or near it, accept delivery, then flip it to india for them. i was thinking scam all the way, but after some googling, i found lots of people on the internet on all sorts of forums who shipped items to this same address, but with different unit numbers. some were positive, some bad. i spoke with another person on XDA who recently did a transaction with the same person and confirmed the guy was legit. he had all positive feedback so i went with it. i worked through paypal, so i made sure he input his shipping address in the transaction details and i updated all shipping info in the transaction as well so there was a paper trail. the phone was received and signed for. a day later, i got positive feedback from the guy and that was the end of it.
bottom line, it could be hit or miss. if you feel sketched by it, dont do it. but i did want to say that these 3rd party shippers are legit to some extent.