Acoustic foam panels can develop a permanent compression dent if stacked wrong, a cardboard layer between each one and a loose wrap is all it takes to avoid that.
Pro tip: Photograph the full wall layout before removing panels if they form a specific pattern, reproducing an intentional acoustic arrangement from memory is harder than it looks.
Watch out: Acoustic foam panels can develop a permanent compression dent if something heavy rests on them for an extended period, keep them clear of stacked cargo.