Hey dholland, biggmike has a point. The only "difference" is one has return-able easy-to-spot ID, whereas the other is harder. Legally speaking however, the matter of "ease" is not left up to us. (if you wanted to be "legal", which .... apparently isn't the concern here).
One time I found a pair of prescription glasses on the beach, which appeared to be a recent loss. As I was on my way back to my truck, passing by a garbage can, I was pitching out all the junk items. As I got ready to pitch the glasses too (which are obviously of no value to anyone except the prescribed owner), I had a change of heart. I decided to do my good deed, and put them on Craigslist L&F. I figured that would be a kind deed, and .... heck ... maybe I'd even get a tip

My ad even said "found with metal detector on such & such beach. Email to describe", etc...
The next morning, when I opened my email box, imagine my surprise when I see an email reply from the police dept in that little ocean-side-burg town. The officer was asking if my glasses fit a certain description. Apparently they'd ..... ironically .... had someone come in to their station that day before, reporting a pair of lost glasses on that beach, to the police dept. lost & found. The police, in turn, must've checked CL for this person, and seen my ad. Turns out, my pair did NOT match that person's lost glasses. But what followed next made it very interesting. The officer replied back to me, that ....
"I'm sure you must find lots of interesting things on the beach here. In the future, we would appreciate it if you dropped anything that you find, off at the police dept here, in order to be in compliance with the law. We have a night-deposit slot in the door, in case we are closed at the time" [emphasis mine].
At first, this odd reply had me stumped. Until I started reading the letter of the law, as it pertains to lost & found, to see what this lady cop was talking about. Doh! It made me think twice about ever posting a "found" ad again! (although I'm sure that was a fluke

) And also oddly, the intrinsic value of a pair of prescription glasses is probably next to nothing, right? Yet to the poor fellow who lost them, obviously he probably paid $100 to $300 for them from his optomotrist, right? So you tell me then, do you go by the intrinsic value, or the value-when-new? (if you intended to be honest with lost & found laws). I posed that question to a lawyer friend of mine, and here was his answer: Turn it in to the police anyhow, and let them decide which formula to use!
If no one comes in to the dept. to claim an item, then the finder gets to keep it. However, the finder (at least in CA) is responsible for the cost of the publication of the "found" ad, that the dept. had to put (as required by law) in whatever local newspaper they put their classified "found" ad in.
And I'd be skeptical if you'd ever get it back anyhow (even if no one came in to accurately describe and claim it). Because ........ think about it: what's to stop that front desk clerk, from merely picking up the phone, on the 29th day of it not being claimed, and telling their cousin Bob: "hey Bob, want a nice rolex? come in to the station and describe the following rolex, that you 'lost' at such and such beach. Then presto, you'll have yourself a nice rolex". Now I know this sounds dastardly and evil, but THINK ABOUT IT! In the eyes of the police, it was never yours to begin with. You only found it. You turned it in fully expecting that someone might claim it. So what have *you* lost? How have *you* been wronged? It wasn't yours to begin with, so how can you possibly care or expect it back?