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You remember all the fun I've had with The Plug. If not, click that there link.
Okay, now that you're all up to date on the story, here's more from that witty Jay.
He enveloped his letter in a lovely, stiff manila documents folder. And, apparently, I am now incorporated. Good gravy - I surely have my patent around here somewhere...
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Documents enclosed: a letter, nothing more.
EXCEPT --- (ta da da DUM):
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...there was a secret message! And it's uber-meta. *shiver* My cup runneth over.
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So he got some Wallace & Gromit goodness in return, with some juicy old stamps.