The shoebox full of gold would be worth around $12M at current prices.

(First Google result for size of a shoebox: …usps.com/…/priority-mail-shoe-box-P_0_SHOEBOX

I just rounded down the measurements for a quick and dirty estimate of the internal volume.)

The downside is that would be 341 pounds of gold so maybe specify for it to be in bars instead of a solid block.

From a quick Google search, I saw a guy managed to fit 7,400 dollar bills into a shoebox. $10,000 bills are no longer printed but still valid, legal currency. Assuming that’s the max. That’s $74,000,000. You could dupe the box and net $148 mil.

However, thinking bigger. Go with a shoebox full of perfect diamonds. The value could conceivably be in the billions.

Just get a shoebox of shoebox pills and you can just get a box of 10’s and 20’s whenever you need.