Always check which sets you're buying... even at a store...

Don't be me and buy 4 advent calendar sets at a time without checking they are the correct year. Bought all 4 series (SW, HP, City, Friends) at Barnes and Noble in 2021 and ended up with two 2021 and two duplicate 2020 sets. Didn't realize it until inventorying this year.

I did not think it was possible for them to have the previous years sets still.