Questions & Answers about Oryginalne opakowanie jest w kartonie.
Because it agrees with opakowanie, which is a neuter singular noun.
So:
- oryginalny telefon = an original phone
- oryginalna część = an original part
- oryginalne opakowanie = original packaging / the original package
In Polish, adjectives must match the noun in gender, number, and case.
Opakowanie can mean:
- packaging
- package
- packing
- sometimes container or box/pack depending on context
In this sentence, it most naturally means the original packaging or the original package.
So it may refer not just to the item itself, but to the packaging it came in.