Indeed, this is an old hack - when I was a kid, I asked my Mom if most of the family was Democrat or Republican. She told me that my grandfather, who was once an Indiana state senator, used to get fundraising letters from Republicans and would fill the business reply envelopes with gravel from the driveway before mailing them back :)
A related hack (and/or fraud?) - every month, the company that manages the apartment I rent sends me a bill in the mail. They send it to me in an envelope with a stamp, but they always place the stamp a couple inches below the top-right corner. This way, the cancellation machine misses the stamp, leaving it unmarked, allowing me to pry it off and use it to mail my rent check back to them! They must have gotten tired of the "I couldn't find a stamp!" excuse for late rent payments. Though perhaps if they took the time to invest in a modern e-payment system it wouldn't be an issue in the first place...
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Indeed, this is an old hack - when I was a kid, I asked my Mom if most of the family was Democrat or Republican. She told me that my grandfather, who was once an Indiana state senator, used to get fundraising letters from Republicans and would fill the business reply envelopes with gravel from the driveway before mailing them back :)
A related hack (and/or fraud?) - every month, the company that manages the apartment I rent sends me a bill in the mail. They send it to me in an envelope with a stamp, but they always place the stamp a couple inches below the top-right corner. This way, the cancellation machine misses the stamp, leaving it unmarked, allowing me to pry it off and use it to mail my rent check back to them! They must have gotten tired of the "I couldn't find a stamp!" excuse for late rent payments. Though perhaps if they took the time to invest in a modern e-payment system it wouldn't be an issue in the first place...