I had this same problem with a registered letter, had a different name on it, but my address was correct.. first time I went in... it was this 40 year old bitch workin the counter and she wouldn't give it to me, but I grapped my pickup card from her and left. she was gonna send it back...
hehe
then later that night it was a different person working the counter, some nice 20 or so year old girl, and I went in and was friendly and explained the problem.. I said 'I need to pickup my letter, I'm expecting this package.. but the guy sending it to me accidentally wrote the wrong name on it, I'm not sure why... but I have ID here, with the correct address and I could give you the senders address for you to verify... and even the contents if it has a sticker on it describing the contents.." and she said 'oh no it's ok I believe you, this is just kinda weird... ya, could you just verify the senders address' so I did... and then she gave it to me and told me to make sure he writes the correct name next time...@!