"The IRS automatically identifies taxpayers located in the covered disaster area and applies filing and payment relief. But affected taxpayers who reside or have a business located outside the covered disaster area should call the IRS disaster hotline at 866-562-5227 to request this tax relief."

The above number might work (even tho your client's circumstances are a bit different), if you don't want to wait for the client to get a notice that you can then respond to..