Spent Bullet Casings - UK

I found several bullet casings in a local park. What should I do

Dummy 9MM Once Fired Brass Casings Used Spent Real New Bullet

bullet casings for forensic examiners - Rubert & Co Ltd

90+ Spent Bullet Casings Stock Photos, Pictures & Royalty-Free

Found on a road in the UK. Looks like a bullet casing but the back

Spent Brass Rifle Round Casing. Bullet Close Up. UK Stock Photo

Empty Bullet Casings - UK

Spent Bullet Casings - UK

308 WIN Brass Shells Bullet Casings Empty Spent Polished Used 7.62