I found this plastic cover laying under the brake master cylinder and can't for the life of me see where it belongs ...does this look familiar to anyone? 2023 Tremor 401a
The evidence I see of dirt on the inside is that it wasnt protecting anything and just hanging out in your engine bay until you found it. Does it appear to "match" any connector close by? It will likely be plugged in, but you should be able to guesstimate.