They are taking my plants!!

It’s hard to be a guerrilla gardener. I planted some violets and some Blue-eyed Mary (Omphalodes verna) and now they are gone! So is the cute little pansy that was growing there, I hadn’t planted it there. There’s no trace of my Silene coronaria either, someone is taking them! So far my daffodils are okay but that’s probably because they are not in bloom right now. I don’t want to plant more stuff is people are taking it…