If you're a business that's forgotten to file your 941's, the IRS might file them for you. They file these Substitute for Returns (SFR's) by collecting your W3 information (which summarizes your employee W2's), which is found at the SSA. The IRS usually get the amounts correct. But you certainly can refile the 941's to replace the "SFR's."
What if you didn't file W2's either? That's definitely a situation where you'll benefit from calling us. In almost all circumstances, you want to file the W2's because you owe it to your employees who had paid into the system for themselves. But there's a lot of issues to discuss, particularly when your business is closed or closing, etc.