Advice - NiB collection sales/donation

Hi All!

I will try to keep this brief. My brother, an avid scale modeler for decades, recently passed away. I have my own wargaming hobby, so I appreciate 'closets of potential' and that these unbuilt models probably have value to somebody out there as I deal with closing down his estate.

If you had to find homes for a reasonably large collection, how would you go about it?

Thanks in advance!