Customs in Palau
Because the Republic of Palau relies heavily on their ocean cargo freight liners for deliveries, that is actually where their main Customs offices are posted: at the ports. Even if you ship something via air mail, it will be processed at the port's Customs office. Basically it is a good idea to check with them before you ship anything there that may be of question such as live plants or animals. Some items may be allowed in but only with special permits that must be acquired before they arrive in Palau. Failure to get the proper documents in order can cause drastic delays in the Customs office and, in extreme cases, your parcels to be returned to you at your own expense. If you have difficulty contacting their Customs office, you can always check with your shipping company for help in this regard.
Security concerns when shipping to Palau
The only real concern pertaining to the security of potential shipments being sent to Palau is when you are talking about piracy. The Republic of Palau is an island chain in the Pacific Ocean so they relay heavily on ocean cargo freight liners for delivery of their goods. And seeing how they are a tiny island group, this naturally leads to ample opportunity for attacks to take advantage of their location and compromise vessels either coming or going to port there. Piracy, even though it is a concern, is not as big of a threat here as many other places, but it is still worth noting so that you can be prepared in case it does happen to your shipment.
Tracking your shipping to Palau
Palau is not close to much so it is advisable that you get a tracking number for your shipment. This will help you know when your items arrive and if any problems occur during transit.