Returning a Lost Object – Banknotes

I found 500 NIS on Friday afternoon a few months ago, in the early morning, in an alleyway. The money was in various banknotes, not in a single bundle, but the bills were adjacent to one another. After about three hours, I hung a note at the location: "I found money here," but to this day no one has contacted me.

I know that money is considered something that has no identifying mark, and that generally there is no concern of yei'ush shelo mida'at, because a person is likely to feel his pocket at any time. However, it seems to me that nowadays people are not accustomed to checking their pockets at every moment. Therefore I wanted to ask: is there a halachic basis that one may rely on to use the money, even without relying on the argument that halachah does not change even if reality has changed?

I should note that near the place where it was found there is a construction site with Chinese workers.

If possible, I request that the question be brought before the Rabbi himself, and I would also be glad to know the reasoning for the leniency, if there is one.

Shalom u'vrachah 

The response of our teacher Rabbi Amram Fried shlita:

If the banknotes did not have an identifying mark, or were not folded together, they belong to him. 

Since a person is likely to feel his pocket, and when he sees that it was lost from him, he despairs of recovering it if there is no identifying mark.

Shulchan Aruch, Choshen Mishpat, siman 262, se'if 3

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