This word was requested by a German Klingonist for an instrument which is called "shawm" ("Schalmei") in Germany, but technically it is not what English speakers refer to as a "shawn". In its orignal meaning, the shawm is a medieval instrument made of wood with only one tube. The German instrument is made of multiple pipes and is made of metal and is called "Martinstrompete". But, due to its sound, it has always been called "Schalmei" – shawn – in Germany.
So, for the usage of the word Sam, it may refer to both things: a) its literal meaning of the original medieval shawn, and b) the martinstrumpet which is usually called Schalmei in Germany.
See Marc Okrand play such an instrument at qepHom 2018 in this video.
Regarding definition #2 – locate, seek and find:
The basic difference between the three verbs nej, Sam and tu' is as follows:
nej(look for, seek, search for) focusses in the search itself, which is usually an intentional search
Sam(locate, seek and find) refers to searching for something including finding it.
tu'(discover, observe) is used like when one notices something, usually without searching for it.