OP, begin writing your whole story down for a summary for your lawyer.
Do not attempt to argue law or defense strategies, just provide the facts.
Gather all the documents or other communications you may have, including:
emails, text messages, localbitcoin communications, telephone numbers, pictures,
receipts, or anything else that will help corroborate your story and help toward
any need for a defense.
Obviously, do not willingly provide any information to the police or investigative
authorities without a lawyer present. It may not be important that your lawyer
knows all the in & outs of bitcoin, as long as they understand it is a non-reversable
payment method.
It is likely that after all is said and done, you may need to return the cash deposit back
to the original depositor, since they may have been defrauded by a scammer and
now you will be the last one holding the bag.
It is also possible that the officer who called you could be the scammer attempting to
get you to return the money to himself. It is important to cooperate with the authorities
after they have proved to be actual authorities, and after you have a lawyer present.
Just begin preparing your proofs, so that you have them and ready if you need them.
Do not hand them to the police, they are only for you and your lawyer's use.
Edit: I just noticed the user above me bumped this three month old thread and I
answered as if it was new.
