If you change your website and some, old-time ago remembered, links stops to work, you must implement a permant redirect to new, working URL!
Failing to fulfil this simple rule may lead you into loosing your customers because no one want's to see some garbage, even when using old links.
Thus, this is very surprising that companies like eBay had fuckups like this!
There is no option that under any condition, your visitor would see something like under this old eBay link:
This is a complete fuckup, no matter, if you're running a small, one-man-business website, or world-famous portal.