ibanez serial number

Hey Everyone! I just purchased a used Ibanez Gary Willis bass in black (GWB35BLK). It was bought used from GC online. I love it but am trying to figure out about its origins. It was listed as '2002 Ibanez GWB35 Fretless Black' with serial number 02984 (no letters). It is stamped on the back and...

Hi I'm offered an Ibanez BTB 1305 premium but The guy is unable to find it's serial number. Q: does it matter? Where should it be on the bass? Also I'd like to be sure that electronic have not been changed, how can I check that pups are the original ones? I'm a bit worried because he offers me...