Found key -- an ethical conundrum

Tonight after dinner I was talking on the phone with my daughters, pacing back and forth on the sidewalk near the restaurant where I had eaten, because it's agin' the law to talk on the phone without a hands-free setup while driving in California. While pacing I happened upon a key, not a car key, but the kind that goes to a building door lock. It had nothing no identifying information on it, and I felt like I couldn't just pocket it without someone stressing out big time if it was a lost key, so I had to come up with a plan.

Being the kind of person who thinks way too much about this kind of thing, I analyzed the situation and my options for how to dispose of said key:

1) Try all the business doors and loot, loot, loot! This has obvious negative repercussions, and, lack of religious beliefs notwithstanding, I'm not the stealing kind.

2) Truck on over to Ace Hardware, where the key evidently was duplicated, which I brilliantly deduced by reading "Ace" on it. This would require either a) walking across the street, which I think also is against the law in California and at any rate would take longer than just driving over there (no joke -- I tried it once), or b) driving there -- but that felt like just a bit more than I was willing to do, even given my strong feelings that I needed to do *something*. Plus, I doubt they would know to whom it belonged, so that seemed like a dead end.

3) Keep the stupid thing and not worry about it. I think I've already established that this was not an option I considered for very long.

4) Toss it through the mail slot of the door in front of which I found it with the hope that it either belongs to that business, or that they would find the rightful owner.

In the end I opted for number 4. What would you have done? Was it a copout and did I only succeed in making it someone else's problem? Genny suggested I return during business hours to inquire about whether the key made it home, which I thought was a good idea.

Only one room number has a locking cover on it

I'm staying at a hotel in the Bay Area this week and my room is on the fourth floor. One of the rooms I walk past to get to my room has a locking cover on it, like so:

It struck me as funny, in an oxymoronic way, to think of an herbalizer who is motivated enough to steal a 420 sign. It must be a problem, though, and it got me wondering how many other hotels have the same kind of problem.

10 points if you got the drug reference (minus 5 points for getting the drug reference; shame on you!).

100 bonus points if you get the nerd reference to my room number: 414.