Walked in to my local GC to exchange some unopened D'Addorio 10-46 strings given to me at Christmas. I use 9's. Wouldn't do it without a receipt. The guy actually started down the road of needing proof that they were purchased, as in, not stolen. I'm retired. I've been around long enough to remember that this was the outfit that originated " the case no longer is automatically included in the deal " and the dime-on-the-dollar value if you want to sell to GC. I don't need this crap. I'll never step into another GC again.