Just check them again.
You need ca.cert, ca.key, identity.cert, identity.key
Two others - backup copies, they will appear after authorization
Example
Directory: Y:\storagenode2\identity
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 6/19/2019 10:04 PM 546 ca.1560971067.cert
-a---- 6/19/2019 10:04 PM 1076 ca.cert
-a---- 6/19/2019 10:01 PM 241 ca.key
-a---- 6/19/2019 10:04 PM 1084 identity.1560971067.cert
-a---- 6/19/2019 10:04 PM 1614 identity.cert
-a---- 6/19/2019 10:01 PM 241 identity.key