larger or beer trap will tell you if its slugs cut a bottle ,plastic bottle in half,full to the top with beer or larger,put it below soil level and the slugs will go for that every time, they will be floating in it next day,Or double sided tape,put it around the side of the pot then stick salt to it kills em,or has soon has they touch it they turn round and go else where.
If there would have been more damage i would have said mouse damage,really small gage netting around it,but there would be chewing on the leaves if it was mice.
Have to agree slug's beer traps,