It certainly looks weird based on what you've said, but it's tough to make informed comments without seeing the listing page.
With the information you've posted, I'd say you've got two possible ways to go at this point.
The first way: You've got an estimated delivery date range from eBay. Don't get worked up about the tracking or lack thereof. Make a note of that last (or first) estimated delivery date and don't bother checking on the tracking until a couple of days before that. Tracking the tracking daily won't change anything between now and then. If it appears that your item won't arrive by that last estimated delivery date, get ready to file a claim of non-delivery through eBay's Money Back Guarantee process.
(As an aside, I interpret the message "incoming data delivery by the sender" to be along the lines of our post office's "electronic shipping information received by sender" message or whatever it is. Something's been transmitted to the carrier, but since the item hasn't been scanned as accepted by the shipper yet, you're not going to see any tracking information. I do find it weird that Ascenda information is supposedly trackable on the Swiss Post site, though. I thought they were separate operations, like how Purolator is 91% owned by Canada Post but they're different operations with different shipping databases. Anyway, I digress bigtime.)
The second way: If your Spider-senses are tingling unbearably at this point, file a claim of non-receipt with PayPal, get a refund, and pay your seller back if and when you receive your item and it's as promised on the listing page. Your seller won't be too happy about this, of course.
If there's any other information that you can provide so that we can give you advice based on the actual transaction and not general suggestions, feel free to post it. Just bear in mind that we can't name sellers on this board, but you can give us the listing number.
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