How to avoid being someone else's "nice find"?

[gawaintheknight]

So I was reading one of the "nice find" posts that pop up from time to time, and I thought to myself, "Gosh, it sure would suck if someone else made a lot of money off my stuff after I die." I thought I would ask how all of you deal with this. Do you have another collector designated to sell your stuff? Do you have written instructions for your executor ("This stuff is worthless, this stuff should go to an auction house (in particular this one, with whom I've already made arrangements), don't throw this away under any circumstances, etc)? Do you plan to sell it all before you die so it's not an issue? Sorry if this is a bit grim, but I thought it might be useful not just for me but for others.