Great Pyrenees needs a ranch or farm to live

This is the sweetest dog I’ve ever owned. He is a rescue and has been living with us for 1 year. He is about 1 1/2 years old (so still a puppy for Great Pyrenees). We call him Huxley.
I would keep him forever if we could keep him in our yard but he runs right through the wire security fence we have. He is wonderful to the neighbors but he does love to take packages that have been delivered to them. He doesn’t damage what’s inside but he brings it back to our house with his teeth marks in the box. This was humorous at first but after 20 + packages have been stolen every one is getting a little tired of it ( they all got their packages back).
The worst thing is he has started chasing delivery trucks and we’re worried that he’s going to get hit.
He needs a function, like a herd to guard!!!
If you can help me place him I would be so grateful!!! #gundogs #gundogcentral #huntingdogs #sportdog #fielddog #dogsofgundogcentral #greatpyrenees #guarddogs #starteddogs #white #forsale #dogsforsale #huntingdogsforsale #male #birmingham #al