Previous house owner still comes to my house for packages

My boyfriend and I moved in to our home Almost 2 months ago. The previous owners were a couple and up to this day, their packages are still getting delivered to this address. At first it was fine for a few weeks. I got their number and I let them know when they have a package. But the last two weeks, they’ve been comfortable just walking into my porch and one time, my boyfriend was outside and the wife didn’t even acknowledged him and just went to pick up her package. Am I over reacting or is this getting irritating?! I’m gonna tell them next time that they are no longer allowed in my property if they don’t change their address!

Btw, they moved to the same neighborhood, just a bigger house. They come pick up the packages when get alerted that its been delivered so I never catch them, only on cameras.