Beginning at about Jan 1, 2004, e-bay changed its policy, unless you are an e-bay member, you can't access completed auctions. Not necessarily an active member, but a member nonetheless.
From another site to which I post, there was a report perhaps commissioned by e-bay, perhaps not, but the gist was that appraisers/self-appraisers were using e-bay to determine values.
I used it as a tool. Sometimes their prices were not at all in line with my own locality.
I miss it. I almost became an e-bay member until they wanted my credit or debit card numbers. I have bought from the internet, but from vendors who take postal money orders.