I have had a C&R for 3 years and just renewed. Yes, they would like to have annotated what you have sold. I myself keep the antiques. Found a couple of S&Ws and a Siamese mauser on Gunbroker, but here lately the sellers have really tacked up the prices. Have had good luck with Classic Firearms and Liberty Tree. Most of the dealers here in No Illinois will accept a Class 3.
Good Hunting, I have enjoyed using mine!!