What post of mine was deleted for wrong board?

I got notification that a post of mine was deleted for being on the wrong board. Thanks for the notification . . . um, what post was it? That seems to be important information! How are we supposed to know how we messed up if we:

1. Don't know what post was deleted
2. Don't know what board we posted it to
3. Don't know the correct board to which we should have made the post?

Here is the notification I received so that you can grasp the complete uselessness of it:

YOUR CONTENT HAS BEEN REMOVED 10 DAYS AGO FROM: RIOT GAMES We have removed your content due to a violation of the following board rule: Adhere to Board Guidelines

You've created some content for the boards. Thank you!! However, to ensure that all content is relevant to the different boards, we have removed it from it's current location and encourage you to post it on a more appropriate board. You can review the Culture and Etiquette within the Guidelines for each board to determine which is best suited for your content. These can be found on the left hand side of the individual board page. Please feel free to share any feedback or questions in the Boards Feedback community.

Don't worry; you're not in trouble! This is just a heads up, and a reminder to become more familiar with the Guidelines for each board so you can ensure your content is appropriate. If we don't keep things organized, the boards will become less useful and a lot more cluttered.

Nowhere in the notification is any actually useful information given, especially since, as far as I know, I have placed all my posts in the appropriate places (aside from this mystery post, apparently).