Why wouldn't they log every single IP you've ever used? That what, 12 BITS of data, at most per IP? Storage is cheap. They may flush or overwrite their IP logs after a certain period of time, but with the high amount of fraud that takes place on eBay, I'm more inclined to think that they keep all records, forever.
Again, I'm just a guy on the Internet, so YMMV!
Again, IP is not the ONLY linking factor, but it is definitely a factor!
I keep running logs of my IP addresses and only clear them out if I physically change Internet Service Providers. Even then, I just name them something like:
IP_LOG_TWC_2008_to_2009.txt
and keep them in my docs. That way if I ever switch back to that ISP again, I can make sure I know what I'm doing with my IP addresses there!
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