Further to what Beeline correctly says, if somebody (eg a mechanic at an MRO) removes a serviceable part from an aircraft it should be tagged with relevant details including reason for removal (maintenance convenience etc). This enables him to refit it to the aircraft within the same company without having to issue a component CRS (Form One/8130).
However if the part leaves that company (goes to a distributor for example) no other MRO can accept it on the part tag alone, it must have a CRS. The MRO may see fit to issue its own CRS based on its approvals and inspection of the part by a qualified person in which case for a part removed functioning correctly it may be certified "Inspected". If it's not possible to determine serviceability from a simple inspection this may have to go down the road of tested-repaired-overhauled etc.