[metmom]

I cannot fathom why anyone would announce this to the world.

Just keep it and shut up.

And yes, have it appraised by a reputable appraiser and then sell them off a little at a time.

[zeugma]

I cannot fathom why anyone would announce this to the world.

I think for some of the rarer coins it's to establish their provenance. If a bunch of those really rare coins were to suddenly show up, there would be questions from the potential purchasers as to the authenticity.