I don't understand the problem either. If you can handle not selling the extra stuff now in the instance that you get a body for nothing, you can equally handle not selling it if you DON'T get the body. Don't sell it.
While it's possible you won't get it - i cant see this as "getting burnt". It's a very generous offer and it's reasonable to be a little cautious/skeptical. If you do get it, all the better. If you don't, sell the gear then.