>> Remember they only get one chip per piece of equipment. And if
>> somebody calls me saying their control unit is broken and I find
>> there's a PIC missing that's going to be very expensive to replace.
>so replace the missing pic with a deliberately fried blank one
>before reporting it as a fault

Which is why one stamps a part number on the chip - even using an ordinary 
stamp pad, but preferably with something that is not solvent soluble with 
water or alcohol. Makes it rather obvious that the chip has been replaced 
with something else. 

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