I actually am having some what the same dificulties... I won an item today, but i have filled in seller id and item number and i get a message that ebay is unable to give me this information as i do not have a transaction with that ebay id... (but i do)...

Since then, the newbie seller has responded to my message with the info i need, but I was curious as to why i couldnt get the info via *find contact information* link on the site map...  has this changed or something? its been a while since i last purchased on ebay.

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I don't think it is anything sinister - there seems to be a small glitch with this function, sometimes it works and sometimes not.   I have had that happen and I asked ebay and they emailed me the information.