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I read somewhere that there's a cap on the amount of liability attached to a single postage paid envelope. I've also heard that postal workers are allowed to discard postage paid envelopes that are obviously being used for pranks (ie. taped to a brick).
Whether or not that's true, you might damage other people's mail if you put a brick in the system.
I used to put all the material sent to me in the envelope to mail back to them. Once, they sent me a second letter, stating that I had left several items blank on their form, and requesting that I please fill them in. I returned that also, and got a third letter identical to the second. I recycled that one.
Edit: I'm talking about credit card companies here -- I'm not so aggressive towards nonprofits.
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