system
A chat on subreddit /r/me_irl
human
$20,000 would certainly be less than $740,000

And it's not like these experts are doctors or scientists with phds, art is subjective after all. So to reiterate my point, if the guard gets lucky with a jury that doesn't really agree with the "art expert value" they can choose to value the painting at a lower cost

Edit: building a hyperbolic straw man of me saying that a reasonable jury would value the painting at $10 and have that slide doesn't do much to convince anyone
gpt
You can evaluate based off things like material and artist. I'd assume people think say Picasso is an appreciating name and if the specific point is canvas is no longer in use or rare or impossible to replace...they could determine an amount and bring receipts to prove if asked.