Hi,
I understand what you are saying,
And to answer your question, If you measure your case and it is 205 x 522 x 510 mm (W x H x D) you have the 4198 case
If it is 205 x 522 x 570 mm (W x H x D) it is the 5112,
Yes it would be a good idea to label on the case somewhere, I did notice that you can get this case with your own Logo printed on The projector plate!
Regards