Forum:Death Eater's wands

How is it that when all the Death Eaters that were captured after the fall of the Dark Lord were still able to re-obtain their original wands? In Deathly Hallows it is said that Bellatrix's actual wand, the one that was used to torture Neville's parents, was the one Hermione got after Harry stole it. Is this just a hole in Rowling's story? Wouldn't the wands have been destroyed when they went to Azkaban? Jcabr003