2. This situation is more difficult to deal with, especially the kind with patterns printed on the tape.
Use a hairdryer to heat it up to a weak windshield. Use a blade to scrape the opening and heat the back of the tape. Be careful not to overheat it, which will deform the tape.
Slowly tear off with your hands, be careful throughout the process. The patterned tape will leave a trace more or less. Be careful not to overheat it, otherwise, more will remain.
A little trick: the faster you uncover, the less the residue, but the easier it is to tear the carton.
The specific effect may be related to many aspects, but as long as you are proficient, it is still satisfactory in most cases. It will not be easy to find when you seal it again without checking it carefully.