The lost and found example is horrible LOL. If I came across that glove, I guess I might be tempted to Google the code, but that's because I'm a nerd. At best you still need to write "IF FOUND PLEASE GO TO 0x.co". And bear in mind that 0 and O are very similar.
If I found that I would think "how weird, someone wrote a hex code on this," and best-case might try to translate it to ASCII or google "hex code graffito" or the like, which I doubt would bring up this site because it doesn't use the term "hex code" anywhere.
