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Commenter huadpe chimes in to say that if you did want to cost them money and make sure the mail goes through, the best thing to do would be to tape a business reply envelope to a Priority Mail carton, which will cost them about an extra $15 to have processed.
When heavy items such as bricks, 2 x 4s, etc., are found in the mails with a BRM card or envelope pasted, stapled, or taped on them as an address label, the pieces should be treated as are other nonmailable items found loose in the mails. If the sender cannot be identified, the matter should be disposed of as waste. If the misused BRM card or envelope is affixed as an address label to a sealed parcel or container, the piece should be treated as dead mail. Please note that these procedures should be followed when a BRM card or a BRM envelope is attached to such heavy items. It is obvious in such cases that the piece is being used in a manner other than that intended by the distributor.