It's not always the rule. Some people think they have bought the thing they will keep for life and throw out the boxes. Also make sure they have the original foam oinserts with the box, since these are very engineered to protect the particular piece of equipment. Stuffing the box full of foam or peanuts is not the same
What's "OBM" ?
See this in ads from time to time....I know it's probably embarrassingly obvious...but I don't know. The only thing I could think of is Owned by me...which should be redundant the majority of the time.