I have a different take.
When a relative died (a person we cared about), one of the family members wanted everything that was of value... "if it is worthless or not worth selling, you can have it." If it had value, it was to be sold so that person could get the money (That's almost a direct quote).
Long story, but the relative died, a lot of my stuff was stored at the house - and a big chunk of it was sold by the 'family member', who pocketed the money. I was able to rescue two antique Briggs-type motors of mine at the last second - they were being dragged to the scrappers when I saw them and pulled them out (and got treated to a lot of angry yelling, even though I had proof they were mine). The "Family Member" had a fit... even though that person would have only gotten a couple of dollars maximum for them. (I was even accused of being a thief and regularly denounced as such afterward.)
So I am VERY hostile to the "sell it ASAP!" crowd. That sort of thinking caused us a lot of harm. (I understand if the person is in a bad way, but based on our experiences, it's the ones WITH money who want every penny they can get.)
I would say: "If your Grandfather meant much to you, hold onto it - you will regret selling it. If he didn't and he DID mean much to someone else in the family, let that person have it with the understanding that it wasn't to be sold and kept in the family. Don't just think about those almighty dollar signs, unless you're close to doing without food or something like that!"
You're right, but hindsight is always better than foresight - if you have a choice (life isn't always that simple). I regret it now, even though the situation was... complex and I really didn't have much say in it.Maybe it would have been a better idea to not leave your stuff at someone else's place.
Maybe Harry knows something about the poster?? My scam radar didn't go off when I saw it...And another thought to consider. Much the same as on Craigs List or eBay, maybe the engine is hot or it's only a photograph from the internet. Always buy with your head screwed on straight and don't allow yourself to be scammed or put into a bad situation because you want it quick and cheap.