My rules on cello and for that matter box lids are leave them as you found them. If your looking for resale especially leave them as you bought them.
If the manufacture put cello on them leave them there by all means nothing nicer then an old smoke in a yellowed cello to get your heart racing.
Box lids - CLOSED. That is how everyone I know that is not displaying them for sale or showing them off keeps them. In fact the some think a closed lid is not enough. Some collectors with a mind to age them long term have been know to wrap boxes in wax paper, saran wrap, put them in an air tight ammo locker, etc. with the belief that less air flow creates better aging conditions. Plus closed boxes stack easier and space is always an issue or it will be.
In fact I heard once that everytime you open a box of cigars and smell that delightful smell of tobacco and cedar it removes that much aroma from the cigar. So smell sparingly.
PS Cello "breaths" so no points there either way.
My answers are cello - your choice based on preference no right or wrong answer
Box lids - CLOSED especially if looking at aging.