You missed on last day....11...and Joined on 2023-04-11
so, missed 9, 10 of april(didn't join) and 11 of may. 30 days total sent.

32 is for those who joined on first day, and missed just one day.
33 is for those who joined on first day and sent everyday, or joined later and sent everyday.
33 is more of a perfect score....then 32, 31, 30 is the number of days gift sent.....

It's a bit confusing....but @seeyouinlumb asked me to figure out people who sent their gifts daily regardless of when they joined....so, I gave them a perfect score.