I think it is a personal choice, I don't think either is right or wrong in this case. To be fair, my take on this would be telling them could be more trouble f

I think it is a personal choice, I don't think either is right or wrong in this case. To be fair, my take on this would be telling them could be more trouble for you then it is beneficial to them, partially depending on the companies size. If the company reacts poorly to the news it could mean lots of frustration and/or headaches for you, and in that way I'd be selfish and just destroy the document and never mention it to minimize my distraction potential.