Dear Tryst:
If I understand correctly, you are not sure that one or more of your co-workers saw the the screenshot, and if any did, they didn’t see it for long because you deleted it immediately. Whomever saw the screenshot for a few seconds, can’t remember the details well, I imagine, because it was removed very quickly. As people live on, having new visuals, old visuals become even more vague, until those visuals are nothing really.
If anyone mentions the screenshot to you, say something like: it is embarrassing to me that it happened, I regret that it did, let this be a lesson to us all (to avoid the specific technical mistake that led to the sending of the screenshot).
anita