A wadded ball or piece of paper being uncrumpled and smoothed
Uncrumpling a notepad page
Tin or aluminum foil sheet crinkle and uncrumple, metallic rustling
Wad of tin or aluminum foil uncrumple & smooth out with metallic rustle & crinkle.
Uncrumple a plastic bag of junk food
Crumple and uncrumple large envelope with clasp
A piece of paper being uncrumpled and smoothed out, short.