It is the responsibility of the installer to check all planks prior to installing.
Most all laminate manufacturers take the view that when you install a damaged plank such as one with a chip in it, this becomes your responsibility and not theirs.
Chips at plank corners, especially those that cross over between planks are caused either during the installation process or by a dropped object.
When a chip is located at a single plank corner, this is usually a plank that was installed damaged or became damaged during installation.
An installer must be careful not to install a plank with a chipped corner and if it chips during installation it should be pulled at that time and replaced with a different plank.
Dents: Like floors of wood and bamboo, laminate floors are subject to denting when a heavy object is dropped on it.
Dents from dropped objects will have stress cracks around the edge of the dent.
Indentations or Gouges: Heavy objects being rolled across a laminate floor can cause indentations or deep gouges.
While some over zealous sales people tend to sell laminate floor as being indestructible most laminate flooring manufacturers state that their floor is scratch resistant. Do not confuse scratch resistant with scratch proof as this is not the same. Usually scratches are not covered by a manufacturers warranty.
Scratch Prevention: Use felt protector on all furniture legs. Keep animal nails trimmed. Place an area rug at all entrances to catch gritty soil and debris. Shoes can trap debris in the soles and scratch a floor. Avoid using hard plastic toys on a laminate floor as hard plastics can abrade a laminate finish.
Most laminate flooring manufactures state that rubber casters need to be used as both metal and plastic casters will cause, indentations, abrasions, scratching or scuffing to the surface of the laminate floor.
Improper casters such as metal and hard plastics can also cause chipping along the edge of the planks.