Two weeks plus the time the shipment went to you it is still a short time to assess the state of affairs. Don't lose hope , I definitely recommend waiting at this crazy time.
Nothing works the way we used to, a lot of running systems are now in some crazy mode. I would solve this at the end of the month, but the partner should communicate at all costs, At a minimum, it should explain if the shipment was sent by regular mail or with a surcharge tracking.
This requires the partner that it should explain immediately that it is a question of trustworthy behavior.
Don't lose hope.
The mails in general are slower than normal since the Covid outbreak.
And the German mail is way slower now than last year.
Sent a letter last year and another 2 months ago. Last year it took ~20 days from Brazil to Germany. This year it took a month and a half.
A side effect of the lockdown I presume.
Personally I think it is very poor of the swap partner, not to have sent information of the tracking number. It would make me a little suspicious, as they should have nothing to hide.
Not to rep!y to requests is not acceptable.