Someone took a 5300 bottom and put it on your 190.  Same case.  All the 5300's say 5300 series on the bottom but if about this mac says 190, its a 190.  The only way to know if the IR is actually there is to pull the case apart.  I have a 190 in a 5300 case also.  It was just left over parts and I did not want it as parts so I made another 190.