Yes I did this once, attached an old cover letter instead of the new one.
Re-send them all TODAY. Just email them and apologise and re-send all the documents. I did this and the employer was very happy to comply. Just don't leave it.
It is easy to do when you are busy/stressed/tired/fogged out from lack of sleep
I just started leaving it off...after putting in a million a day it gets really old going back and changing the hospital name every time... or maybe I'm just getting more cynical by thinking "what does it matter anyway..." lol
Have you ever *made* a med error? This is no where close...chill, hang loose, and either resend them with the right date or don't worry about it...people write the wrong dates all the time...no worries, eh?
OR, you could just leave it be and if someone points it out, exclaim, "Well FINALLY!!! I dated the letters with the wrong date to see if anyone has the same attention to detail that is expected of nurses in regards to charting! Whew! I thought I would never get a response from this experiment! Since you caught it, I know that your hospital employs staff with meticulous attention to detail, and I want to work for a hospital with high standards. THANKS for catching it!"