How can we know if its safe to turn a phone back in?

I am turning a Pixel 3A XL back in to Sprint. I did not have a pin or any lock screen at all on the phone. I did a factory reset. Is my old data encrypted and hard to find by the new owner or did it need to have a pin on it to enforce encryption?

If I now go and create a pin on the wiped phone and reset it again will old data be encrypted?

thansk.

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