It is very annoying that sort of damage. You are right, a lot of it is in the packing because you can be sure when you ship something that:
"Every stage in the shipping is equivalent to throwing the item down one flight of stairs"
One option you could consider rather than repairing it is to consider a cabinet corner to cover it, that you could make, or buy and coat a dark brown color. Cabinet corners both in 2 and 3 hole fixing types are readily available, here are some from AES:
https://www.tubesandmore.com/product...e-34-thickness
A very good type of lacquer, if you are opposed to polyurethane, is nitrocellulose in spray cans, these are sold by the Luthier's suppliers, but you can find it on Ebay, this gives the amazingly shiny finish you often see on electric guitars etc.