There is definitely something amiss with the activities of the exchange site because I don't expect the police authority to go on a fishing exercise without any back-up to their claims because they surely know the implications of such.

There would surely be a bigger reason as to why they are raiding the business other than safety and to be safe, except you are running your own security architecture, you will have to still trust the exchange site and be sure to not keep the excess of your funds there.