[Babul]

attached objects' (object-to-object + object-to-player) parameters can NOT be obtained from the client. since the parameters are being sent to the client in order to calculate the data there, its your job to care for storing all data, like object id, bone, modelid, position offsets and rotations.
when creating (attaching) the object, make sure that everything gets saved into a server-sided variable (enum/PVar), which can indeed be accessed at anytime later.