Just go over and get your property when your neighbors aren't home.
If everything you've said about your neighbors having warrants out for them is true, I'm sure they aren't going to cause any trouble with the law for taking back your own property. And even if they do, you can say they just flew back home where they came from in the first place. The law is not going to take the time and expense to prove otherwise over a couple of guineas; just make sure no one sees you do it.
It's really as simple as that if you want it to be.
If everything you've said about your neighbors having warrants out for them is true, I'm sure they aren't going to cause any trouble with the law for taking back your own property. And even if they do, you can say they just flew back home where they came from in the first place. The law is not going to take the time and expense to prove otherwise over a couple of guineas; just make sure no one sees you do it.
It's really as simple as that if you want it to be.