That's a bad print. Those pockmarks are probably left from the support lattice from the printing process, but they should have been largely moved prior to shipping, and should not have marred the surface like that. Usually they're little nubs you can scrape off with a hobby knife, but something clearly went amiss in the curing phase there.
Contact Shapeways and send them that picture, letting them know you've gotten a misprint. They should be able to get it taken care of.