Its just a way to sell seconds cheaper and not get into issues with Evergreen resellers. The panels themselfs are identical in every way sns the cosmetics defects, which are trival IMHO. The Evergreen panels with SUN HS label perform the same as the full price panels.
If you don't need to should a UL sticker to install then these are the ticket and unless someone actually looks at the sticker on the back, they look just like the full price Evergreen panels. The Electrons sure don't care
There is an entire industry for selling seconds/refurbished products, some times its just a way for a manufacture to dump inventory and not have issues with retailers, IE its brand new in everyway, but labelled "refurb" just to move excess stock. As the Solar Panel market continues to expand, so will the availibility of "seconds" for solar panels as there is always minor "opps" in making panels that are frame art perfect