I had a similar situation with an (active) alarm and monitoring system in the last house I purchased. One of the first things I did was clip the wires, remove

I had a similar situation with an (active) alarm and monitoring system in the last house I purchased. One of the first things I did was clip the wires, remove everything and throw it in the trash with a few other things the previous owner had left behind. You are under no obligation to store or keep active property abandoned after a sale (at least here in the US).