I own a computer service shop, so I've seen a lot of the fakes. I read up on the issue a while back. Anybody with an Internet connection can be a pirate.
As for
eBay, a lot of people used to sell operating systems "with hardware". They'd just throw in a stick of untested RAM, and would call it a day.
As for eBay, this is the list of Windows 98s that were on eBay:
windows 98 | eBay
Apparently, they still sell.
If the OP was looking to just burn a CD of Windows 98, and include one of them with the booklet, that's a big no-no legally. You may just be able to sell the booklets by themselves, but I can't help you much there. My last Windows 98 machine that I sold was back in 2009.
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