hey bros a mate of mine just recieved these and suspicions were raised when we noticed the amps never had lot no or exp date on them.it has lot no and exp date on the box,looks like this has been printed seperately.the batch no-022,date of mfg-04/99,exp date-04/2004.i have tried to scrape writing off amps with a blade but it will not come off.are these ok to use but personally i think someone has stitched him right up.what you guys think?