What others said, it can take several weeks to get your receipt notice. If mailed, they receive it but then they send it onwards. For example mine was sent to the Chicago Lockbox, but the case was handled by the National Benefits Center in Missouri. It was the NBC that updated the status to case received and sent out our receipt notice. So really, you have to give it time to be received and forwarded on, then for them to get to yours and enter it in. It can take time. It was over 2 weeks and our check hadn't been cashed and I was freaking out too, but it did eventually get cashed and all was well in the world.