This is the 12867th most frequent Swedish word.
stulna
"Stulna" means "stolen" in English.
In this sentence, 'stulna' functions as an adjective that describes the jewelry being stolen.
De stulna smyckena hittades gömda i ett låst skåp.
The stolen jewelry was found hidden in a locked cabinet.
Here, 'stulna' is used as an adjective qualifying 'föremålen', meaning the items were in the state of having been stolen.
Polisen återvände de stulna föremålen till deras ägare.
The police returned the stolen items to their owners.
In this case, 'stulna' modifies 'cyklar', indicating that the bicycles were previously stolen.