The thieves being comfortable enough to get in your place in the first place is where you need to start.
Time to talk to a alarm company like ADT that will put a dozen stickers on the inside of your windows telling the burgulars,look -you are going to jail if you mess with what's in this property again.
Things like making sure your mail is not where someone can see you are not home,lights that stay on at night to light your property,no large bushes next to your house.
Anything you can do in advance that denys to a burgular any comfort that they can even get near your house without being seen.
Park an extra car in the driveway to make it loook like someones home-not in the back of your property where it's more convienant for you.
Even posting signs such as -"This property is under remote video survelliance at all times,All trespassers will be prosecuted,"
And most important of all is this.
No security technique you use will be effective if you disclose ways to defeat it to people you think are your friends.
You need to keep your mouth shut about just what you are doing and how you are doing it and especiually when you work late or when you are not at home.
Thieves love to know the homeowner won't be home for eight or ten hours.
Makes them all warm and fuzzy as they ransack your place.
And finally,definitely spend the eight hundred or a thousand dollars and buy a real gun safe and use long,heavy gauge screws to shoot it to studs in the walls of your house.
It would not hurt to have some kind onf sensor added to the room it is in so when the dirtbags come back they are greeted by a one hundred and fifty decibel air horn like sound coming right next to the safe.
Anything you can do to make a thief unsure he is safe is what you want to do-paramount is-tell NO one WHAT YOU ARE DOING.
And finally-you must stay alert to anyone who is prechecking your security peremter around your house so they can find a time that is best to break into your place.
This includes anyone who just shows up out of the blue or who starts asking unwarranted questions about your personal activities.
That's NONE of their business and you just got a break in who is stealing from you if they keep that up.
Sadly,it's usually someone you know and thought you could trust.