I think you could make two versions of the game, one with and one without the sound effects? Or maybe you could make it with them but you leave a note on your menu to the reviewer saying "the sound effects were premade by other creators before the gamejam, please ignore them when reviewing". I don't know. Just, don't. It's not that hard to use Audacity or LMMS or Bosca Ceoil to make your own sound effects or music