Why not a stock certificate :-)
https://www.apmex.com/product/50847/enron-corp-stock-certifi...
https://www.apmex.com/product/50847/enron-corp-stock-certifi...
Also I love that website. As a recent casual collector of paper currency. I never thought to buy some old stocks/bonds.
Edit: it’d be hilarious I’d the Enron stock was fake