I hope you wrote on the slips of paper you put in the guitar cases, "Sell at market value, not for what I said I paid", or something to that effect.
These days, it is fairly easy to get everything sold on the Bay or some such site, even if sheet music, books, and magazines do not fetch high prices. One guy sold all of his possessions except for about a dozen items. I don't think he owns a guitar. Of course, I'm sure some stuff will have to be thrown out.
Have you seen Wolf Hall on PBS? It's a show about Henry VIII and Thomas Cromwell, who is brilliantly played by Mark Rylance. In a scene where Cromwell is breaking the news to Francis Weston that Weston will be put to death, due to uttering some foolish words about wanting to marry the Queen after the death of the King, Weston says:
"It's just...I thought I had another twenty years."
and Cromwell replies:
"...Well, we know not the hour, do we, Francis?"
which, of course, is a reference to the Bible, from Matthew:
"But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only." King James version