It's definitely a rare find nowadays, especially in never-worn condition. If you're still hunting for info on how to take care of your new shirt, I have a suggestion. I found some great tips on
Mato & Hash for taking care of personalized trucker hats, and a lot of those tips can be applied to shirts as well.
For example, washing your polo inside out and using a gentle cycle can help maintain the fabric and color. Also, air drying instead of using a dryer can prevent any shrinkage or damage. I've followed these tips for my trucker hats and they’ve stayed in great shape for years.