Canada Post does it again!

There have been lots of posts and threads about post offices, not just here in Canada, who seem to be falling down on the job. Marker monkeys. Non cancelled stamps. Etc, etc.
Here's a new one I thought I'd share. Received an ebay purchase in the mail today, and this is the envelope it came in.



Addresses have been covered to protect the innocent.

So what we are looking at here is a 1986 FDC , complete with official Canada Post first day of issue cancel, with extra postage to make up the 85¢ domestic postal rate. Sooooo, Canada Post allowed through an already used and cancelled cover, which they themselves cancelled 30 years ago (though I'm sure it's not the same postal clerk on duty!)

I'm not sure to be amazed, appalled, or what!

Obviously no one at the post office is looking at these things. And I kinda have to give the ebay seller a nod, but do I do that for his gumption in sticking it to the Man, or for risking my purchase with insufficient postage?

I don't collect new material, but this may have to go in the album with a bit of a note.
Possibly it was just a bit of a delay. Postmarked April 14, 1986, delivered June 15, 2016.