Doesn't sound like a robbery, sounds like a simple theft.
If he is charged he is given a first hearing date, where he pleads guilty or not, if he says not then they adjurn for another date to get more evidence and witnesses. You will be asked to go to court to give your statement.
It may sound like a lot of hassle, but if it happened to someone else and you heard about it you would want them to get the punishment they deserve, if you don't go to court when asked then he will be released, and no doubt just go and do it again. Don't give him the opportunity,