Possibly use that info in the encyrption key. So without that it doesn’t work. Or it wipes everything if that info does match :-)
Tell them the only way to get the data is to use the password on the original drive.
Well, as a professional, the way I would handle this situation is I would still make the image of the original drive and save it to a secure location. If I absolutely had to use the original drive for the decryption to work, I would do so. If the attempt at decryption corrupted or erased the data, I would just re-image the drive with the original data and try again. As long as the hash values of the original drive and the image match, the courts will accept it as a true copy of the original for evidence purposes...
True, BUT you still need to decrypt it and the only key you get from me deletes the data you think is there while giving you the phony stuff.
So how could you even tell if you got everything or not?