Napoleonic Jewelry Finds

I've heard several claims regarding flea-market "discoveries" of jewelry "authenticated" to have belonged to Napoleon. Here is one that appears on the Antiques Roadshow site. Sounds like a recurring urban myth to me...

http://www.pbs.org/wgbh/pages/roadsh...ission208.html

Or did it really happen?

[Tootsie Plunkette]

Sounds fishy to me.

The locket did not open, but she figured she could take it to a jeweler and have it opened there. ... she took it to a jeweler. He told her he did not have the tools to open it properly and said her best bet was to try a jewelry store in New York City. .... When she brought it to Tiffany & Co. they told her it would take a few weeks to get around to opening it so she left it there.

How hard is it to open a locket?

Tiffany & Co. ... told her it would take a few weeks to get around to opening it... When she returned home that evening, she had an urgent message from Tiffany & Co. asking her to call back right away.

So which was it, "a few weeks" or "that evening" that Tiffany opened it?

She was offered a huge sum of money from Tiffany & Co. but wound up selling it to a museum in New York City for an undisclosed amount of money.

That should be easy to document - which museums in NYC have collections of historic French jewelry? The Met? Cooper-Hewitt? MCNY? Someone want to check them out?

ETA:
I just looked through my copy of The Age of Napoleon: Costume from Revolution to Empire 1789-1815, the companion book to an exhibition at the Met in 1989-1990. An entire chapter devoted to jewels, and pictures of many (from numerous sources) that were part of the exhibit. No engraved lockets in there, nor mention of any. If such a historic piece were in a NYC museum, you'd think they would have included it in this exhibit.