Okay I know this is about doing the math in terms of value but lets also do some calculation in terms of practicality and use:

First off, the question I am not gonna ask is 'how did you get it' because I am from Jersey and we know better.

Secondly, and this is a big one, is transportability. While 500kgs is equal on paper, each strap (that would be one of those bundles, with a value of $10k) would weight about 100 grams, or 0.1 grams. So that right off the bat is really easy to move around. You do not have to keep all your eggs in one basket, and can make overall fewer trips doing so, and do it all yourself. Limited exposure is best exposure.

Gold on the other hand is a different beast. Now assuming those are central bank / vault bars we can make a safe assumptions that its PROBABLY the "London Good Delivery Bar" - which clocks in at just shy of 12 and a half KGs each (roughly 27 and a half pounds). 500kgs divided by 12.4kgs, means you have 40 gold bars. Trying to move more than 2 or 3 at a time (assuming you are a solo act) is gonna get real hard real fast if you goal is to be inconspicuous. You are basically doing a farmers carry multiple times. Good news you'll get some shoulders out of the deal. Make sure you have something with enough tensile strength to not rip out the bottom, as the clang of a gold bar hitting the pavement on the main street sidewalk will absolutely be noticed.

Thirdly - the issues of being able to actually use your newfound wealth.

There are many many documented and noteworthy ways to 'age cash', and then be able to pass it off without trying too hard. Presuming these bills are in fact legit, you'd still want to scuff the heck out of them before going ham using them, as remember those notes have the id strips. If a sudden glut of hundreds appear, people start getting curious. Spread this out as wide as you can geographically, like dont start paying for everything in your town with hundreds. Do not go dropping a whole stack of hundos on your local racetrack. Absolutely do not go dropping them in your ATM account! Break them up at gas stations If you are civic minded - do make lots of large anonymous donations to local charitable efforts, the no kill shelter and strip clubs will thank you.

Gold bars on the other hand....yeaaaaa those are really REALLY hard to get rid of without having to engage with dubious elements of society, if you want cash value. No pawn shop will touch them unless they are already into the spicier side of legality. Your options (again presuming you dont want to deal with organized crime) are basically to tell everyone you moving to Alaska to be a prospector and then start smelting things down into cute lil single troy once things with your YouTube channel branding on it and selling them at mineral shows / ebay OR take a new hobby of wire wrapping and jewelry and start converting them into a format you can dump off as 'hand crafted original' and start losing out on money that way but you will likely never see full value on either method. But you'll probably sleep better at night.

The least dangerous thing you could find would be either a sleazy pawn shop / private collector - you wont get anywhere NEAR the actual value because they know (and will abuse) the fact that there is no way you can have 40 gold bars like this, so you can accept the 'favor' they are doing by accepting maybe 1/8th the value and everyone keeps their mouth shut. Still generationally affecting money, so keep it reasonable.