The lean mixture faults are caused by unmetered air in the intake system, and has nothing to do with the evaporative system. The evap system is the fuel tank ventilation system, if that had a leak it would be different fault codes. One of the other ways to check for intake system leaks is to have a diagnostic tool that reads live data watching the upstream O2 sensor signal voltages and spray down all suspect areas with brake cleaner/carb cleaner etc and when you hit the leak the O2 sensor values stick pegged out at max rich. But the smoke tester is usually easier.

I'd figure out and fix the mixture faults, clear the codes. Then if the cat converter efficiency faults return again you might need to replace them. But I have seen those cat efficiency codes pop up every so often with mixture faults and never come back again.

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