Found it

[Orion1876]

Its not a tool but I found a $20 bill on the ground outside the porta potties at Country Thunder a year or 2 ago.

I'll come back if I can think of a tool example.

That was mine.  I dropped it there accidentally.  Please send back to me.

I have found a few broken tape measures and flashlights over the years.  Never anything worth keeping.  Usually there is a reason why it was left behind.

This tape measure was like brand new

Only thing I have found that has been useful is a fishing pole that was in pretty good shape when I was fishing in Galveston one year.  I snagged it when I was fishing off of a pier.