Well since you're storage rate was about 1000 dollars a month...I'd say you could file a claim against him. Unless he has proof that he left the bike with you and that you sold it directly to the seller on craigslist..I think he'll find it hard to press any charges. If he has proof that he left the bike with you for that time period...then I'd say you can press charges since theres proof that he left the bike in your hands for that time period without contact or payment for storage of the bike.
Pretty much I dont think the guy can prove anything and if he can...then you can prove that he's stored the bike at your place for several months and owes you as much as you'd like to charge him for storage fees.
Tell him to fuck off