In two years I worked as a subcontractor there they tried, you walked in on day one in your work clothes emptied your pockets, filed out the questioner about pins, plates, staples and artificial joints, you went through a state of the art metal detector and readings were recorded. Now every time you went through they would check your specs and you were allowed a <2% difference if you were outside that spec, into the strip room you went, they ran everything through an incinerator, garbage, the waste from all the drains including the bathrooms so if you even flushed it it was recovered.
In those two years there were 2 instances where people were caught, one was this guy from the projects who worked as a laborer, he was there to basically do all the bullshit work and was part of my crew.
Because of the security we were escorted everywhere, if you wanted to go to the bathroom you had to wait for an escort so unless you had to crap it was easier to go behind the tank farm and just take a pee. Well in the first week this guy made a big deal about how he had to take a mean wizz and made a big deal about how he wasn't gonna wait, (just go pee I don't need a blow by blow, just go).
After about 7 or 8 minutes he came running out from the tanks screaming "RAT, RAT" and has this little mouse in his gloves and pitches out over the double razor wired perimeter fence.
Nobody blinked an eye till he did it 2 more times in a week, the following week he comes into work with a new ride, traded his VW Rabbit in for a used Lincoln MK something or another. That was when security pulled him in four questioning, seems he brought in a hollowed out dead mouse, would put gold dust into the cavity, tape it up and pitch it over the fence, nobody thought twice because the place was loaded with rodents in the back by the tanks.
On of the processes used wood chips/saw dust as some kind of filtering medium and because they went through such huge amounts they were always willing to let employees take all they wanted for gardens and fire starter.
Anyway we had this guy who would take a wheelbarrow full every Friday, security would check the chips, check the handle of the wheelbarrow, the tire and each time it took longer to pass him through. Security by the 8th week knew he was getting something valuable out and they were determined to figure out how, they questioned him, the guys he worked with, even the regular security staff thinking that maybe they were some how in cahoots and letting him get out with something.
After 3 months they had to give up they couldn't prove anything, turns out he wasn't stealing gold, silver or platinum which was everywhere in the plant, you know what he was stealing?
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Ready for this?.
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He was stealing...
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Wheelbarrows and shovels.

ok, ok, that was the story this old Security Guard we used to call Quicks Draw McGraw told me and my buddy over lunch one day, the other story was true though.
BTW Matt, here's my Case Mini Coke Bottle in 512 layer Parker Damascus from '89...