Except according to the eBay posting guidelines, it is not permitted to post item numbers.

And yes, I know that many people do it, but doing so can lead to a slap.

I think it's only against guidelines if you post an item number in the title of a thread.

It is the title only 🙂

 

which might be why some are removed, but others not:

 

posting violation

 

• "In the title of a threaded discussion: Posting user ID's in a derogatory manner, posting URLs, item numbers, or web sites, or violating any other board posting policy."

Well that's handy to know, but I wonder why the distinction?

One of the many delightful quirks of the system 🙂

Search by bidder was handy if a buyer was slow to pay and you could check their bidding history and see they had been buying up a storm and not likely they were going to be able to pay for all the items.