Read more about it here:
Reconstructing records after a disaster:
- to recreate inventories business owners can get copies of invoices from supplies
- get copies of prior year tax returns: sales tax, payroll returns, business licenses, federal, state and city returns
- look at phone and other mobile devices for pictures that may help.
IRS Disaster Assistance Hotline 1-866-562-5227
Disaster Resource Guide Publication 2194
IRS Tax Tip 2017-56