Gotta love MS.... lots of answers about everything except what you need to know ;)

We have a bunch of systems here that have OEM lables on them which were used so we can use our VL keys etc.

Now we need to move the components from those cases and put them into fresh cases - whats the story with our OEM labels ?
 Are we allowed to do this, or would we have to buy new licenses in theory ?

Ive read the following...

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Generally, an end user can upgrade or replace all of the hardware components on a computer—except the motherboard—and still retain the license for the original Microsoft OEM operating system software. If the motherboard is upgraded or replaced for reasons other than a defect, then a new computer has been created. Microsoft OEM operating system software cannot be transferred to the new computer, and the license of new operating system software is required.

If the motherboard is replaced because it is defective, you do not need to acquire a new operating system license for the PC as long as the replacement motherboard is the same make/model or the same manufacturer's replacement/equivalent, as defined by the manufacturer's warranty.
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Would a case change fall under "hardware" as such ?

TIA