Clint- as a past financial crime investigator (did it for my last 3 yrs on the job) and as a victim of ID theft--- DONT WAIT.
Call your credit card companies first thing in the AM or tonight and verify your past charges-some companies are better than others but be prepared to tell the story to several underlings before being transferred back to the first one and starting over but eventually to somebody in this country who can help. Ask for the fraud Div right off- it may help.
Also call your bank and check for any irregularities or applications in your name.
Also make a police report for future verification - your local cops will likely not be able to even get to step two in this as it most generally leads to other countries but the report may be needed by CC companies in the future -if necessary.
In the case of ANY irregularities cancel everything immediately-even change your bank account numbers.
You will find with CC companies -if you were hit- they will send an affidavit and you will be absolved of responsibility- it can take a while and some businesses will later try and resubmit their bills to your new card- be aware.
In your favor here is that the return scam is not new having been commonplace for a few years now - have never heard of it being associated with the ID thefts I described but YOU are the only one watching out for YOU.
Don't wait for MONDAY- START NOW.
Betcha your return will be further delayed as they too seek needed verification via an affidavit and notary an understanding person on the phone generally doesn't cut it- like every one else they will likely need a paper trail.
Bet this is why you have waited as they got two of you looking for a return may have sent it to their fraud div for a while and kept it quiet not knowing which one was the crook.
Good luck- again -most likely just the IRS thing but CHECK the other stuff