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two more 5-packs, wait two weeks. Gone.

Two words: tether chain. If they want the Sharpie, they have to take the whole desk with them.

For the single, solitary pen which occupies my office desk, I prevent against thieft by putting a red cap on the blue pen. Pen thiefs can be easily found by browsing their desks for said mismatching pen.

A similar trick may work to not only deter Sharpie thieft, but catch thems that done it. Or, maybe driving nails through the cap (whilst removed) so people can't put them in their pocket and walk away. Well, can't do it painlessly, anyway.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set