I started a topic on 01/21/2015 called: "World Junior Hockey Championship - Same Day Cover"
It featured a Picture Post stamp (which takes weeks to arrive) with a date the same as was printed on the stamp!
This is impossible!
Perhaps this is the seller that Unitrade is referring to. He made a few of these "First Day Covers" for sale on eBay
He was obvioiusly cancelling them himself: Kalona BC, I believe.