I guess by Silent Night trumpet notes you are looking for the sheet music for the trumpet solo for this particular song.
I found a video of the music score on YouTube:
A recommended site for sheet music is the Free Scores website, as it only requires you to download the PDF of sheet music, which you can find here
The information I have given above is for the solo trumpet piece in the Silent Night song (sometimes it is played as a duet with the trombone).
This piece of music was written by the Austrian composer and church organist, Franz Xaver Gruber in December 1818. He wrote it as a musical accompaniment to a poem written by his pastor Josef Mohr, creating the first German version of Silent Night.
Franz Xaver Gruber
