Beepster
I know for a fact that if I kicked it today and my next of kin got ripped off selling my stuff that would upset them more than having to put a little thought into getting the right price.
I suspect you might have a bit less gear than I do.
In my case, I've accumulated stuff over the decades and it's not just a little thought on my part but rather it would be pages and pages of (necessarily) very specific instructions on what's what, what's been swapped out, what goes with what. It's not just a matter of, "these might be worth this much".
And having all the receipts doesn't matter as value doesn't always correspond to what I paid for it either - a 15 year old digital synth or digital FX box may be worth a tiny fraction of what I paid for it while a 30 year old analog delay may be worth more quite a bit more than I paid for it.