Looking for a Buddhist story about trust I heard a Buddhist story about trust some time ago and am trying to locate it.

The story goes, there are some men travelling (I think) to a temple or monastery and on the way they get swindled and lose all their belongings to a con (or something, somehow are tricked)

When they get to the temple or monastery they are asked what they have learned.  The first man says 'not to trust anyone' and is not admitted.  The 2nd (or 3rd) man says that he has learned to be careful who he trusts and so is allowed entry.

Does this sound familiar?  Does anyone know of a Buddhist tale that is similar to this?

Thanks!
The Pali Canon has some good ones on the "Trust, but verify" theme, like the "Four Great References" in DN 16, the Gotami Sutta, or the famous Kalama Sutta of AN 3.65