replaced license plate lights but broke wiper control

My license plate lights were out so I removed the hatch panel, replaced the bulbs, and reinstalled the panel. I had to remove the panel again because one of the lights still wasn't working (turns out I had replaced LEDs with incandescents), and when I did I saw that I had broken the little blue box which had been hanging loose, labeled wiper control Toyota ABS Denso -- see pictures. I don't think the electronics were damaged and the rear wiper still works. How is this supposed to be attached? Does it matter if it isn't firmly attached?