for what its worth, if you follow the instructions here to access the database directly, you can see the data is present here in the database;
cd /var/discourse/
./launcher enter app
# start the Postgres console
sudo -u postgres psql discourse
# run this SQL command to list all invites
select * from invites;
I will look into try to use the Data Explorer plugin to see this from the website UI Discourse Data Explorer
it seems like this is something that should just be built into the Admin panel though