I don't like to write test posts on daveverse.org but it's the only WordPress site I have that has the site and post id feature. I want to be sure FeedLand is processing this stuff correctly, so that requires a test post here. I will add more information so it's not entirely a test post.
The question I wanted to answer was this: If I post something new to daveverse, will it have the site id and post id in the item record for the post. Answer — it did.
The next question is this: After I update the post will it retain the site and post id in the item record. Let's find out! The answer is yes. Whew. That says the code I had suspected of being wrong was probably right all along. It's just that I was testing with feeds that didn't have the elements that make this work.
So now the question is how to get along?
Update: A comment from Jeremy Herve says this is a bug and will be fixed. Well I did not foresee that possibility, but that's the easiest option for me. Happy.