First thing I tried was looking at the private key. Just using a light in the background (the sun), I was able to see about half the private key. With a magnifying glass, I could probably see the entire key without too much trouble.
(Example of this security flaw irl:
You lose your 'checkbook', someone else finds it, writes down all the public keys/private keys, hands you back your 'checkbook'.
As you fill your checks [to use them], someone else just jacks the money.)
Really, it's an uber neat check
Quote from the past -- Literally exactly 2 years ago I got this check. It's still in rather decent condition.
The edges are torn a bit, but honestly, it's held up pretty considering the amount of abuse I put it through (it was a bit larger than my wallet, so that's why the edges are torn, not to mention the amount of times I've folded / shown it to other people / etc...).