...put the wrong address on your RSVP postcard. Argh. Hey....three have them have showed up so here's hoping the rest do! The address is just two inverted numbers and the address doesn't actually exist. I guess I just hope! Do you think calling the post office or hanging a sign on the mailbox would help?
Re: What not to do....
uh oh! I have no idea what to tell you! Can you post a blurb about it on your wedding website homepage? And get fam to help let others know through word of mouth...

I couldn't find much online about it, but I think it would be worth a shot to call the post office to see if anything can be done!
I was in charge of our 10 year class reunion and thought I did so good on planning and invites. Everything looked so nice and professional.....except I forgot to put the Event Date on the invites!!!!!! It definately makes you crazy to make mistake like that, but it will lead to some memorable phone conversations
If a few have made it to your mailbox regaurdless that's a good sign, and a little word of mouth about the number switch would be good for those who haven't yet replied.
A little Snafu that will likely have lots of people talking.....ABOUT YOUR WEDDING