This is the 351st most frequent Swedish word.
hittades
"Was found."
Here, 'hittades' is used in a passive form to indicate that the keys were found by someone unnamed or by chance.
Nycklarna hittades under soffan.
The keys were found under the sofa.
In this sentence, 'hittades' signifies the passive past action of discovering the book's location.
Efter flera dagar hittades boken på biblioteket.
After several days, the book was found in the library.
Here, 'hittades' is employed to describe the passive occurrence of the phone being discovered, with an explicit agent mentioned (a passerby).