So last month I ordered an item. $130+ AUD. The seller was from the Philippines and had an all-round completely positive feedback history. He is a helpful guy, and even informed me it'd take up to 4 weeks to receive my parcel. However, a whole month/4 weeks has nearly elapsed now and I have nothing in my mailbox. I live in Australia, and the postage carrier is Philpost. I don't want to be the sourpuss and drop the first negative feedback on his profile as I know it's not his fault. 

Could the parcel be delayed? Could have it been sent to my post office instead of my mailbox? It's not a massive item, so I don't know why one would hesitate to pop it somewhere I can notice it. Any advice or help about this issue? Should I obtain a refund/cancel the order? Get in touch with the carrier or my post office?