Your name in print isn't the same as 'published'
Would you care to post a message about some of the worst "credentials" that an author has used to try to get you to read a manuscript? I've heard of authors using one POD notorious for pretending to be a "Traditional Publisher" as a publishing credit, but I'm sure you have seen a few that top that. Have you ever seen any queries with real howlers in them, like bragging that the attached novel is a NaNoWriMo winner?
For those Snarklings unfamiliar with NaNoWriMo, it's short for National Novel Writing Month. And kind of like the Special Olympics, if you cross the finish line, You're a WINNER!
They have a lovely web site that explains it all.
Now, there's nothing wrong with doing NaNoWrMo. Have at it. It might actually do you some good to have a deadline and be forced to post your progress.
However, don't use "winning" as a publishing credential in your cover letter to Miss Snark or any other agent.
I've never gotten a query using that, but I have had people tell me they're published poets..and they list the poetry publisher who publishes almost everything entered in a contest and then charges $65 for the book. I've used to write back saying "this isn't what you think it is" but now I don't.
I've had people tell me they are book critics when they mean they post reviews at Amazon. I've had people tell me they are columnists at the local paper when the local paper -desperate for free content- will publish "guest opinions" from anyone in the zip code.
These folks aren't trying to put one over on me. They honestly don't know that what they're doing isn't taken seriously by agents or editors. Most of them are nice people who enjoy writing as a hobby. I don't fault them for that. More power to them in fact--they READ the books I sell.