Law / Police in Poland call me 3 days after i report an lost of Phone in a Bar [6]

Poland Police call me after 3 days after i report an lost of Phone in a Bar by emergency line.
After 3 days police call me and talk about the lost phone but i found the phone later that day so i tell them i found my phone ,but they tell me to come to Police station to have some paper work.

They give me one phone number and ask me to call in that number when i came back.
Right now, I am not in Poland so is it really important that i must go to Police Station??