Tax Forms Delivered to Wrong Address by USPS

I took two pieces of tax related mail to the local post office to be mailed by Certified Mail;

• one, form 3520, to an IRS PO Box in Utah and the other
• a MA filing (with a refund due) from my wife, to MA Dept of Revenue PO Box
• both envelopes and Certified Mail slips were filled-out correctly. I have the receipts.

On checking the USPS on-line tracking site, I see that each piece of mail is going to the other address:

• USPS has delivered the Utah mail to the MA PO Box and
• the MA addressed mail is on it’s way to Utah!

I do not know what to do. I'm concerned about potential penalties if the IRS and/or MA DoR do not get their documents!

Many thanks!