Don't fuss about tracking.
For the buyer its purpose is to give you the warm fuzzies.
For the seller the purpose is to have proof that the item has been delivered if the buyer claims it has not.
Tracking doesn't speed the parcel.
Tracking is not insurance.
Tracking doesn't prevent damage in transit.
If your parcel does not arrive in 20 days from North America (30 days from Asia, 15 days from Europe) go to the Resolution Centre and open an Item Not Received Dispute.
If the seller cannot prove delivery, you will be refunded in full. If the seller does not refund promptly, eBay/PP will refund you and go after the seller for their money. Hard.
If you are not home when the parcel arrives, the shipper will leave a Notice of where and when it can be picked up.
If you ordered through the GSP, and the purchase has not arrived within 20 days, mention the GSP in your Dispute.
Never accept an offer of a replacement. It will not arrive either.