Plastikote on handles - +10. Get 2 pots of different colors - if one handle is lime green, the other is orange, ugly as it sounds, it WILL stand out.
I engrave my initials in a triangle somewhere on it. And take its picture. If I buy something from an estate sale, I engrave a single line thru former marks, and remark it as above.
Bad news - if it gets lifted, it will end up fenced to some scumball at a flea market a county over, and the local cops don't want to "make waves". Take pictures of your tools, marked, and you might have a chance. Maybe.
Bottom line - lock your tools up at night, install an epoxied-into-concrete anchor point under where your toolbox rests and chain/padlock your toolbox to the ground.
True story - Had a thief hit our shop twice, about 4 months apart, when I worked in Oakland - first time they got away with a drill press, a band saw, and 2 tool boxes in the main shop (thank god mine was on the work truck for a call the next AM!) - we think they came in with a van truck and lift gate, as they weren't there more than an hour (security patrols...) Second time, everything was chained down as above - you could see where they had moved them, but they didn't go far.