As the reclaimed collection are all tumbled bricks, they come in various shapes. The tumbling means corners can be knocked off, chunks can be missing and some of the slips may be slightly shorter due to whole edges missing. This is all part of the reclaimed look, please make sure you spread the most misshapen ones around (as with the different colour variations) as this will enhance your project, where one has a corner or edge knocked off, you'll need slightly more mortar to fill that gap- just as it would be in an old wall.
If you think on delivery that some of the slips are chipped, this is possible of course, check the box for the missing part to see if this was part of the look or it has been broken in transit, but even so, it could still look perfectly at home on the wall with the rest.
If your installation is being done by a tiler who doesn't have much experience with brick slips, you may want to make them aware of this, to ensure they don't leave these ones out and end up either short or having to use them all next to each other.