One of the enhancements in the last release of Illustrative Mathematics was making the site crawlable by search engine bots. As a result, you can, for example, google “illustrations for A-SSE” and get direct links to the tasks that illustrate Seeing Structure in Expressions in the Algebra category. Googling “illustrations for 2.MD” takes you to the page in the illustration index which includes all the illustrations for 2.MD. Bing doesn’t seem to be working as well at the moment, but there is a bing bot crawling the site at the moment, so it may get better.