I don't know any more than this, I'm afraid. The police simply said that it was two white guys in a black van who posed as gardeners and stole her purse. Reading between the lines, they probably wouldn't have gone to the trouble of impersonating gardeners if they planned to snatch it in front of her, so presumably it was a ruse to get into her house and take it. No, I don't know what accents they had. Since the officer didn't mention them as being of note, I presume local or neutral English, but honestly no idea.