When i presented my AP to the customs in Nepal immigration, that person was familiar with the document. He thought my green card was being processed lol but I didn't correct him and he stamped departed on my pp. So don't worry, people there knows about this document even the agent of the airlines ticket counter at TIA knew about this as I didn't have to explain anything to them.

Just know that you will be taken into secondary inspection by US immigration. Don't worry or freak out because the paroled stamp is usually kept in that inspection office.