He used to
fill the envelopes with lead and drop them in the mail,
in the hope that he would cost the party even more in
excess postage than they were already spending to send
the funding pitches.
Piker. *Real* practitioners of this sport would attach a business-reply label (basically a postcard you can affix to a package) to a *brick*, thus easily sticking the recipient for US$5 or more, of course worth a lot more backintheday.
For many years now, though, anything like either case is officially classified as "waste", which means the USPS throws it out before it ever gets anywhere, same as happens when you dump your trash into a mailbox. I suppose Canada Post does the same.