Is there a way to put special instructions on the package for USPS to hold the box for cust pickup?

[AmandaAchieve]

I am shipping items the customer would need to pickup from the post office and need to know if shopify can accommodate that and if so how to set it up.  Said another way, I'm not sure how to alert the Post Office to hold the package for the customer to come in and get it.  

Please let me know.  Thanks!!!