I received a empty envelope in the mail?

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So I received a letter with my name on it, I open it up and it is junk mail. Just some letter about someone wanting money so I go to throw it in the trash. Instead of throwing it in the trash though I put it in the blue box where you place letters and mail that you want mailed. So then the next day I check the mail again and I notice I get a envelope with nothing in it! It is just a empty envelope. Well you would think I would realize then what I did the day before, but no I do the exact same thing again. I place the empty envelope in the blue mailbox where the outgoing mail goes! So I am still not catching on to what I did. I don't even think twice about it. Then later on that day or the next day my mother tells me to mail a letter. Then when she tells me this I realize what I did. I haven't got to check the mail since that day to see if the empty envelope is in their yet. I think I may have even folded it up like it was trash. I still can't believe I did this. It's so funny.