Who murdered the lions?

Hint 1 of 10:

You should have found a lot out about the lions at the Carriage Stables.

Hint 2 of 10:

Did anything look suspicious in the cage?

Hint 3 of 10:

How about those leather pouches?

Hint 4 of 10:

Surely, you must remember something about the thefts in Germany.  No one was
caught because there wasn't enough evidence.

Hint 5 of 10:

That means they couldn't find the stolen goods.

Hint 6 of 10:

The pouches surely could have held something.

Hint 7 of 10:

Don't forget that the lions were in Germany near the time of the robbery.

Hint 8 of 10:

So someone probably wanted to claim the contents of the pouches.

Hint 9 of 10:

Someone who knew about the pouches but couldn't get close to them without
killing the lions.

Hint 10 of 10:

That only leaves one person -- the thief.