When you fiddled, it’s possible that your custom posts were created with your “Shows” post type, not “Gig”.
You could check that in the database directly using PHPMyAdmin or whichever tool your host offers.
In PHPMyAdmin look for your wp_posts (the wp_ could be different) and look at all of the posts probably clicking on the ID column to sort the newest to the top, then scroll to the right and look for the post_type column of a row that contains one of your test posts.
It’s not ideal, but you can now delete those posts (you should also find the posts_meta for them), or change the post_type column. Or just leave them alone and they shouldn’t cause you any trouble. Unless you create another post type called Shows which could bring them back.