Can I use Auto-Fill from CRA twice on a return to get new slips that have been added?

[dgjohnston101]

I fear that using Auto-fill a second time would duplicate all the slips I've already downloaded.

[TurboTaxSusan]

This is a small chance of getting duplicates, but unless you have made changes to the slips that you added the first time or manually added new ones, then duplication is likely not going to happen.