In Rogue One, we see Jyn's mother kneeling next to her and giving her a necklace and saying "trust the force." We later find that Jyn has been imprisoned by the Empire for years and then rescued again by the Rebellion. Only a little while after that, we find out that Jyn still has the necklace, despite having been captured and thrown in a cell.
What I'm wondering is, how did Jyn keep the necklace from the prying eyes of the Empire? For comparison, the Nazis would have their prisoners hand over every valuable on their body, and then would have them go through inspection again several times before and when they reached the concentration camps. Although it is assuming a lot to say the Empire did the same, how was Jyn able to keep it from them?