Why Don't I Pay More Attention? (tax return mistake)

Our accountant finished my taxes a little close to the deadline, so I just scanned it, signed and mailed it.

As I was wondering today, why the website said that my check was mailed on May 6 and I still dont have it...

I realized that he accidentally put my old address in Melville on the return...its been over a year and they aren't forwarding my mail anymore.

I have a feeling this is going to be a big headache for me