Nand:/sys/log/product.log

This file contains a manufacturing log from the factory. Here is an example:

0,BOARD,START,1.5,09/04/27,16:06,000131, ,
0,BOARD,OK,1.5,09/04/27,16:07,000131, ,
0,TP_CAL,OK,2.0, , , ,(643 827)-(3453 3323),
0,AGING,OK,1.0, , , ,Time=60:19(m:s)
Count=32,
0,FINAL,START,1.5,00/08/07,10:18,000109,TWL Ver.2.0,
0,FINAL,OK,1.5,00/08/07,10:18,000109,TWL Ver.2.0,
0,MIC,OK,2.1, , , ,All Test Passed,
0,CAMERA,OK,2.1, , , , ,
0,WRFU,START,0.60,09/04/28,09:44,000156,P000173 G000156 717cfde74f5ef6763473,
0,WRFU,OK,0.60,09/04/28,09:46,000156,PCVer:1.7f
R-51 -54 E0.00 0.00,
0,IMPORT,START,1.1, , , , ,
0,IMPORT,OK,1.1, , , ,Region=USA,
0,NCHECK,OK,1.0, , , , ,

Another example from a latter model (EUR green DSi XL)

0,BOARD,START,3.0,10/07/29,12:08,010600, ,
0,BOARD,OK,3.0,10/07/29,12:09,010600, ,
0,TP_CAL,OK,2.1, , , ,(599 755)-(3493 3307),
0,AGING,OK,1.0, , , ,Time=60:19(m:s)
Count=32,
0,FINAL,START,3.0,10/07/30,16:53,010600,TWL Ver.3.1,
0,FINAL,OK,3.0,10/07/30,16:54,010600,TWL Ver.3.1,
0,MIC,OK,3.0, , , ,All Passed(DC_Amp:2240),
0,CAMERA,OK,2.1, , , , ,
0,WRFU,START,2.01,10/07/30,17:02,000037,P000024 G000037 260efde7f78805c23473,
0,WRFU,OK,2.01,10/07/30,17:03,000037,PCVer:2.02f
R-42 -45 E0.00 0.00,
0,IMPORT,START,1.2, , , ,Sys=1.4.1 Pre=U2,
0,IMPORT,USRAPP,1.2, , , ,1.HNGP 2.K2DP 3.KCDV 4.KNDV 5.KNDH  ...,
0,IMPORT,USRAPP2,1.2, , , ,6.KGUV ,
0,IMPORT,OK,1.2, , , ,UTL IMPORT EUR,
0,NCHECK,OK,1.0, , , ,UTL NCHECK EUR (C914),

Note how in this case it specifies the factory firmware version on line 13. Also, the line 5 shows date in other format (the same format as the first 2 lines). Line 14-15 logs the installation of preinstalled DSiWare apps (in this case DSi browser, Nintendo DSi + browser video, Dictionary 6 in 1 , A Little Bit of... Brain Training™ (German version), A Little Bit of... Brain Training™ (Other languages) and Flipnote studio respectively)