You'd imagine a good number of these items would have been dropped accidentally, or possibly by not the legal owner (e.g. after a robbery).

This one, clearly looks like someone tried to destroy it and throw out https://belowthesurface.amsterdam/en/vondst/NZD1.00540KST014...

it could as well be stolen and the thief tried to destroy it

No because there is no proof of intent.

But there are some thrown away guns in the collection so may be some old crimes will be solved.

That's interesting, I read of someone who got done because a shop receipt was found on the street. They went to the shop with the receipt and were able to find the transaction's credit/debit card details and then went to the bank with those to id the person who was then successfully prosecuted for littering.

"But there are some thrown away guns in the collection so may be some old crimes will be solved"

Surprisingly few, I thought.

It looked I saw some bones too as I traveled back a few hundred years. Wonder if they are human.

There are some human bones.