I like this thread because buying a car is very important for everybody and rightfully the subject is for discussion here.
We all want to believe that the "new" car with 161 on its registration was rolled off the assembly line yesterday, vacuum packed and spirited 100% intact to the forecourt of some main dealer. Paddy turns up, hands over €30,000.00 @ 0% interest and drives his virgin car away with zero on the clock - Not so! The likely situation is the car you bought was rolled off the assembly anything up to 18 months ago, stored in an open compound, bombarded with sunshine. It is then driven to some ship to be ferried to Ireland, fairly open to salt winds and even salt water. On arrival in Ireland (or even to another EU country prior to being ferried again to Ireland),the car gets driven off the ferry to another holding compound from where it is collected and brought to another holding compound. Remember, the car is open to the elements since it left the construction assembly line. The manufacturer then has the cars moved to one of several compounds around the country. Your main dealer purchases several cars, each one tested for colour, damage, etc beforehand. The new car will then be driven or carriaged to the main dealer's forecourts and can travel between forecourts in other locations.
At the latter end of the process, new brakes might be required, clutch parts might have to be replaced, etc etc. So, if the clock shows 200kms of usage, it would not be a concern to me. Remember it is possible your "new" car is older than the runaround your spouse bought six months ago. Best of luck with your new car.