I got them here:
https://www.dropbox.com/scl/fi/jjwv4beuvilox64cnm31x/Ghost_Trap_SFX.zip?rlkey=1j8ibmc01cmen54bjcxr8z6yu&e=1&dl=0
https://www.dropbox.com/scl/fi/jk55yb12mr956lyyv1xqi/GB-SFX.zip?rlkey=fcqf69faydx3y0db6gi755vv8&e=1&dl=0
They are not my files. The subject is covered here at GBFans:
https://www.gbfans.com/forum/viewtopic.php?t=41197