Assuming they were used in your gaff, you should keep some spares - you will need them at some point. You probably know this but just in case it could save you some heartache down the line.
I just installed a floor like this and I have 3 planks left over. How does needing spares work? Don't you have to take up the entire floor to get to the bit that needs replaced (or at least work back from the last installed piece)? Maybe I should get another box whilst I can
Assuming they were used in your gaff, you should keep some spares - you will need them at some point. You probably know this but just in case it could save you some heartache down the line.