I bought a cheap £50 wifi camera from "geek", which sends alerts to my phone, if it sees anything different.....plug n play....that way, at least you can watch folk stealing your stuff....
Similar to this one:
geek.wish.com/share/5407mhgrgs
You need a little patience, for the slow boat from china, and a micro sd card.
This is what the picture looks like.....although yours may be different....