You got my order
One thing's certain with Shapeways, order from them enough and you'll see all sorts of ridiculous stuff.
I haven't gotten any unexpected puzzles so perhaps there is a third party involved?
I have an email from UPS about a Shipment from Shapeways that should arrive "Thursday, 10/04/2012, By End of Day". Checking my Shapeways orders page to compare the tracking it should be David Pitcher's Pentamid.
The order of mine you got is listed as:
Sep 17th 2012 147287 INC-0003257 Sep 27th 2012 Pending
So perhaps they realize they've made some mistake and that they haven't shipped me anything. There's a chance they'll print again and ship me a replacement order like nothing ever happened.