Stuff falls out of packages at the depots, and often they can only guess where it comes from, so they sometimes make mistakes putting it all back together.
Give them a call, they will usually have a large box full of this stuff waiting for it's original owner to call and claim. It will be around, just give them a call, a camshaft is a pretty obvious item! they will have it catalogued by date found so will be able to guess it as yours if you give them the details.
I used to work their at one of the mail sorting centers as a maintainer on the big sorting machines. There are about 50 or 60 cameras on the floors looking at everything, the security camera guy enters and leaves by his own entrance and never mingles. The stuff that comes out of the mail would stagger you. Always maybe a hundred dollars a night from the machines, knives, diamond rings, pieces of metal cross section, usb sticks, car parts, junk....just everything.
People stick all kinds of things in an envelope and then they fly out at 10 meters/second as they negotiate the right hand bends in a mail sorting machine. Two dollar coins from nanna are choice little projectiles. They are the right mass and size to fly out of the envelope.
I used to curl up under a machine with a mangled magazine of choice that had been ripped to shreds and otherwise mangled
All the money (coins of small amounts) goes in a big collection box and goes to a charity of Ausposts choice. To make sure you were spotted by the cameras doing the right thing we all use to have these elaborate swan lake style skips and jumps to deposit the coins in the box.