those leaves won't do anything to help the cutting. if the bag has too much moisture, it might actually rot sooner or later. but removing them also is not a great idea. why place it in total darkness? i know sun light doesn't help, but room light shouldn't do anything to cause issue as far as rooting is concerned.
also, i don't understand when you say "in an oven bag full of moist perlite". is the cutting covered with perlite? or sitting on top of it? i know with other members using moss, some just let it sit on the top of the moss. but i use paper towel and make sure the bottom of the cutting is wrapped with it.
if there is sign of growth, leaves or roots at 3-4 weeks, i would just move it to a cup. if the cuttings stays in a bag too long, there is great chance of rot.