Again, it depends on your definition of “found”. I was looking for evidence on one drug search warrant and found $30,000. On another I found $680,000. But the money wasn’t misplaced by the owners. They knew exactly where it was.
I found a $20 on the sidewalk during my morning exercise walk around the neighborhood.
But that’s not the interesting part. I found ANOTHER $20 in the same place on my second lap 15 minutes later.
That day at work I was telling everyone that my morning exercise program had finally started to pay off!
In maybe 2002 (during a 2.5-year gap in my employment history, I walked out of my apartment complex on the way to the bus stop, and came upon a folded $20 bill. Which, when opened, revealed two more $20 bills. My efforts to find whoever had dropped them were fruitless, so we had an extra $50 that week.
A couple of years ago, Kayla came across a lost $50 bill while at work. Per policy, she turned it into Disneyland City Hall, and collected it several weeks later, when it remained unclaimed.
A fellow pedestrian and I spotted $160 on the sidewalk in Brooklyn. There was no one else in sight, and no way to know where it might have come from. We split it down the middle.
Um, do you normally find a $10 bill every week? Or perhaps your math skills explain your 2.5 year unemployment? 
:smack: missed the edit window:
$60.
I assumed you were deducting the $10 you used to buy everyone nearby a beer, which is of course the first rule of found money.
I found a white envelope containing $120 in the parking lot of Caesar’s Palace once. Didn’t try to find the owner. He probably would have just lost it at the blackjack table, anyway. Instead, we went to the steakhouse inside and had a steak and lobster dinner.
Found $80 (four twenties) on the sidewalk when I was doing my noon walk when I worked in Downey. We were on the edge of the section of Eminent Domained housing where the 105 Fwy was supposed to run. So, there was nobody around to give it to. A few decades later they finally built the 105. Since I was living in Redondo Beach at the time, I thought it was such a shame the 105 hadn’t been built then.
When I used to jog I was always finding loose change. The vast majority were pennies, which I assumed people were too lazy to bend down to pick up. At the end of the year, I had nearly $30. One quarter, a few dimes and nickels, but, yeah, almost all pennies.
Ages ago I took an old book from one of those boxes of freebie books you used to sometimes find in Laundromats and similar places – sort of impromptu ‘libraries’: take a book, read it, leave it somewhere else for the next person to find. It had 22 $20 bills in it! Tucked in, one by one, every ten pages or so.
Man, was that riches at that time and place. 
All I can figure it was someone’s secret ‘stash’ that got disposed of accidentally or maybe by someone else.
Not cash, but I found a diamond while sweeping a stockroom where I worked years ago. It was unexpected, but not out of the blue. A lady in the shoe department told me she had lost one a couple of days before and asked me if I’d keep an eye out. I figured it had probably already been swept up and thrown out, but while sweeping I saw a sparkle in front of my dust mop and sure enough, it was the missing diamond. She had told me it was insured for several thousand dollars, but that it was an heirloom. A few days later I got a reward from her insurance company that made up for how short I was on my rent for that month.
When I was about 13, I was riding my bike home and saw a wallet lying in the street. I picked it up, it contained $27.50 in cash and nothing else. In those days that was about half the rent my family paid for our house, so say about $500 in today’s money. My dad said I could keep it if I ran an ad in the paper and nobody claimed it. As I recall,it got saved for college. Tuition for a semester.