|Don't be such a guzzler, Mail Monster!|
But it really was! When the Mail Moster came back all the way from Canada, it has swallowed another envelope (the red one)!
You can see here a big scary Mail Monster, awaiting for fresh letter to be posted:
And Barb's answer to the question:
I've never heard of mail monsters before but the more I think about it the more I'm pretty sure they exist. Take for example how sometimes mail travels with rapid speed between two places and other times takes forever to reach destination. Perhaps the mail monster ate too much candy for breakfast and was working in hyper-alive :)
Then, there are times when a letter simply vanishes or shows up months later with 'return to sender'after so much time you actually forgot all about sending it. Perhaps, the mail monsters have a unique sense of humor and send mail to the wrong people... on purpose?