Any chance it wasn't the Cancer Society? Or did they leave a blank receipt? I know in summer there have been reports of people driving around loading up expensive Kettlers, nice strollers, patio furniture right off of people's front porches or even back decks. If it was the Cancer Society, can you find out where they take the stuff for processing and hustle down there? If they won't give it back, small claims court, even though they are a charity.
That is awful though. I hope you get your things back. My son would be so upset too.
Kimberly