Does anyone here have a BabyRest Delux Latex Innerspring Mattress?

I think the baby shop has given us the wrong mattress and just wanted to check with anyone who has the above mattress.

Just wondering what the product code was on the actual mattress?

We have an AM25 but the packing states it should be an AM45. We have tried looking only but can't find anything. And the store is claiming its correct but a few things aren't adding up.