I know I am changing the subject a bit, but,..I was at some training once given by the ATF ( I was LEO for 35 years) I really stuck my neck out in class in front of everyone since I like to buy and trade up guns as a hobby. I asked how many guns can a guy sell/trade in a year before he gets himself in hot water and would need a dealers license (FFL) I really could not pin down that Agent down to a number as hard as I tried. It was very subjective as to who was investigating and what they thought at the time. Not very comforting even to me. He did say all rules are suspended if you are liquidating a gun collection as part of an estate.. Bottom, line....I would never tell anyone you are making a profit,.. takes away the old hobby defense. Besides that would be true for me since I usually went backwards, cash wise, in my efforts to get something new. as for cache...?? anything that does not fit in one ammo can.