tjsan, sorry to hear about your package from O-Cha. They have been my fave vendor for at least 4-5 years. You should contact the seller directly, although they will not be able to track the package.
I have had a few packages arrive very late from various vendors in Japan ... around 3 weeks as I recall and only lost one (out of a total of likely close to 100). So there is still a chance, but the chances are getting slimmer by the day.
Since you are in Poland(?), perhaps your customs got a hold of the package ... in the USA that can cause lengthy delays.
I rarely opt for EMS for small tea packages from Japan, cannot justify the added expence when standard shipping rarely takes more than 5-7 days.