Hi Christopher and welcome to the forum.
Yours is a very sad and unfortunately not uncommon tale. Strictly speaking you cant advertise them here, but you are asking advice and I would think that is ok.
generally the boats are not worth much unless they are museum quality. and advertising on a well known auction site is unlikely to realise their worth, or anything near it.
Personally I like the idea of giving the models to someone who will use them, possibly a club, or even to someone who may be able to realise some of their value to assist a good cause.
Sorry, not much actual practical advice, but over the years there have been several posts such as yours and I have yet to see a follow up detailing a decent outcome. I know that when the time comes, most of my models will simply go in the bin, they are worth so little.
Ashley