I almost always buy new but if I see a used component that I am really interested in one of the caveats to moving forward is whether or not the original shipping box and interior packaging is available and request pictures of such. I pass on those that don't regardless of how much the seller assures that he/she will package the item well.
One thing that I do when selling is to send the buyer pictures of the item powered on, powered off , being wrapped , the box and packaging , the item inserted in the box, box sealed Also, I'll get another box to insert the original one in and take and send pictures of that before and after packaging. I'm just mentioning this as something aamiransari you can consider requesting to get some comfort from a private individual sale.