If the pins are there, then just go and find them. If they have been removed, or moved, then they will have to be reset and that is where the money is. It is a labor expense. If they can find one pin, then it makes the job easier. With all the building that is going on in the country, the surveyors are just as busy laying out new house lots and doing other work. If they take time to do your job, it has to pay the same or more than doing a house lot job for it to make economical sense to them. Today, everything is time and $$$$. If you can't find the pins, rent a metal detector and start looking. If you have the original survey, you should be able to find a starting point. Purchase a 100' tape measure and have someone help you find the corners. It isn't rocket science, but it is time consuming. When you set your fence posts, set them back a foot from the line and you will be safe. If the lines are a clear line of sight, that will make it easier for you also. You can rent a laser level to shoot the lines, depending on your level of understanding of how it is done. If you want to do it on the cheap, then get some wooden stakes and string. If it is a wooded lot, then it can be challenging. If it is a open field, then it is a piece of cake....