Sorry this post is a little late. . . . but the easter egg hunt is from April 10th to April 30th.
If you have already found the egg last year, this year you will be able to keep it! You will still have to find the new locations for all the easter eggs to get the new freshly made 2020 trophy.
To view eggs you have found: Go to "Personal" > "My solCloset" > "Easter Egg Hunt"