Lost/stolen Nexus 7 tablet

We were shopping today at Walmart and had to leave the story because the power went out and my wife is pretty certain it was taken out of the cart because she didn't grab and it has been hours. We called and nothing was turned it yet.

We sent the lock request but it is a wifi only tablet and there has been no attempt to connect to the internet, so it can't be locked. We do have our phone number to call on the front screen in hopes someone would call if lost and the main profile has a password but the kids profile does not.

Is there anyway to get the police involved if they try to buy stuff on the tablet, or anything.

Anyone have any tips on what do to?