I have 1 dated from January, and the rest (all empty) from the moment I installed Precise:
$ ls -trl .goutputstream-*
-rw------- 1 michael michael 0 Jan 29 04:28 .goutputstream-G3GV8V
-rw------- 1 michael michael 0 Jun 3 20:58 .goutputstream-SE2CFW
-rw------- 1 michael michael 0 Jun 3 22:42 .goutputstream-B128EW
-rw------- 1 michael michael 0 Jun 4 14:40 .goutputstream-786GFW
-rw------- 1 michael michael 0 Jun 4 16:51 .goutputstream-XALXEW
-rw------- 1 michael michael 0 Jun 7 01:46 .goutputstream-XDR1EW
-rw------- 1 michael michael 0 Jun 7 08:50 .goutputstream-4U3TFW
-rw------- 1 michael michael 0 Jun 7 18:07 .goutputstream-H4EIFW
-rw------- 1 michael michael 0 Jun 8 19:16 .goutputstream-A1UPFW
-rw------- 1 michael michael 0 Jun 10 19:10 .goutputstream-FJDRFW
-rw------- 1 michael michael 0 Jun 12 15:36 .goutputstream-TXCTFW
-rw------- 1 michael michael 0 Jun 13 16:08 .goutputstream-YE6MFW
-rw------- 1 michael michael 0 Jun 15 18:43 .goutputstream-0RVYFW
-rw------- 1 michael michael 0 Jun 16 13:58 .goutputstream-PQ3OFW
-rw------- 1 michael michael 0 Jun 18 02:11 .goutputstream-GV7XFW
-rw------- 1 michael michael 0 Jun 21 02:20 .goutputstream-ENX9FW
-rw------- 1 michael michael 0 Jun 22 02:21 .goutputstream-8X5EGW
-rw------- 1 michael michael 0 Jun 23 04:46 .goutputstream-HEW7FW
-rw------- 1 michael michael 0 Jun 24 14:36 .goutputstream-YE7KGW
-rw------- 1 michael michael 0 Jun 25 14:48 .goutputstream-8DOBGW
-rw------- 1 michael michael 0 Jun 25 19:04 .goutputstream-3ZDCGW
-rw------- 1 michael michael 0 Jun 27 08:47 .goutputstream-HAXDGW
-rw------- 1 michael michael 0 Jun 27 17:14 .goutputstream-609JGW
-rw------- 1 michael michael 0 Jun 28 01:26 .goutputstream-RHQKGW
-rw------- 1 michael michael 0 Jun 28 08:48 .goutputstream-SK3GGW
-rw------- 1 michael michael 0 Jun 29 20:14 .goutputstream-9NVEGW
-rw------- 1 michael michael 0 Jun 30 04:36 .goutputstream-FWUQGW
I have 1 dated from January, and the rest (all empty) from the moment I installed Precise:
$ ls -trl .goutputstream-* G3GV8V SE2CFW B128EW 786GFW XALXEW XDR1EW 4U3TFW H4EIFW A1UPFW FJDRFW TXCTFW YE6MFW 0RVYFW PQ3OFW GV7XFW ENX9FW 8X5EGW HEW7FW YE7KGW 8DOBGW 3ZDCGW HAXDGW 609JGW RHQKGW SK3GGW 9NVEGW FWUQGW
-rw------- 1 michael michael 0 Jan 29 04:28 .goutputstream-
-rw------- 1 michael michael 0 Jun 3 20:58 .goutputstream-
-rw------- 1 michael michael 0 Jun 3 22:42 .goutputstream-
-rw------- 1 michael michael 0 Jun 4 14:40 .goutputstream-
-rw------- 1 michael michael 0 Jun 4 16:51 .goutputstream-
-rw------- 1 michael michael 0 Jun 7 01:46 .goutputstream-
-rw------- 1 michael michael 0 Jun 7 08:50 .goutputstream-
-rw------- 1 michael michael 0 Jun 7 18:07 .goutputstream-
-rw------- 1 michael michael 0 Jun 8 19:16 .goutputstream-
-rw------- 1 michael michael 0 Jun 10 19:10 .goutputstream-
-rw------- 1 michael michael 0 Jun 12 15:36 .goutputstream-
-rw------- 1 michael michael 0 Jun 13 16:08 .goutputstream-
-rw------- 1 michael michael 0 Jun 15 18:43 .goutputstream-
-rw------- 1 michael michael 0 Jun 16 13:58 .goutputstream-
-rw------- 1 michael michael 0 Jun 18 02:11 .goutputstream-
-rw------- 1 michael michael 0 Jun 21 02:20 .goutputstream-
-rw------- 1 michael michael 0 Jun 22 02:21 .goutputstream-
-rw------- 1 michael michael 0 Jun 23 04:46 .goutputstream-
-rw------- 1 michael michael 0 Jun 24 14:36 .goutputstream-
-rw------- 1 michael michael 0 Jun 25 14:48 .goutputstream-
-rw------- 1 michael michael 0 Jun 25 19:04 .goutputstream-
-rw------- 1 michael michael 0 Jun 27 08:47 .goutputstream-
-rw------- 1 michael michael 0 Jun 27 17:14 .goutputstream-
-rw------- 1 michael michael 0 Jun 28 01:26 .goutputstream-
-rw------- 1 michael michael 0 Jun 28 08:48 .goutputstream-
-rw------- 1 michael michael 0 Jun 29 20:14 .goutputstream-
-rw------- 1 michael michael 0 Jun 30 04:36 .goutputstream-