A good friend of mine found a body a few months ago. It’s a pretty shitty experience. And it’s actually a lot like what OP describes. A sense of foreboding and suspicion combined with a conviction that these thoughts are foolish. And an uncertainty whether to check or to alert someone or to just try to forget it.
Op, I’d report it and ask them to please follow up with you and let you know. It’s probably nothing, and you’ll feel better once you know it was nothing, and that you did the responsible thing in having it dealt with.