Also, too much tape can be annoying especially scotch tape. For the most part, most traders are considerate and use blue masking tape. But when scotch tape is used, I get somewhat annoyed because it's harder to open and/or take off. I have to take my time so I don't end up ruining the cards.
So for best practice.....use masking tape over scotch tape.
"Masking tape is low tack tape. ... Masking tape is easy to remove without leaving a residue, as long as you don't leave it too long (days). Scotch tape is a hightack tape used, among other uses, to stick paper and card together. Difficult to unstick and will leave a residue."
Also, another best practice that I do is re-use some of the trade packaging that I receive. Save money and the environment by not throwing away the stuff you can re-use. Save that stuff guys and re-use.