Whatever works! LOL! If you know there are strays in the neighborhood and they aren’t in your yard, Ghost could be the reason.
You might need to get another carrier since Peaches and Ginger use the one you have. Ghost won’t want to get inside.
OR, he could take it over and then THEY won’t be able to use it.
I think he’s already taken it over. I have opened the front door a couple of times and he zipped out of it.
It might be why mine stay in when it’s cold. Ginger has a hidey-hole in the storage shed at the back of the yard that I’ve put a soft towel in for her, but Peaches just has me. sigh. LOL! Even before Ghost, he wouldn’t go in the carrier. I think he didn’t feel safe...felt trapped.