NBPR but include beer receipt?!?

[beetrothed]

I found a $3 off $10 of beef of chicken MIR that says NBPR all over it, but on the instructions on the back it says "Send: store receipt [circle beef or chicken product and Negra Modelo or Modelo Especial on receipt]..." and below the spot for the address there's a line that says "Enter UPC codes from beef or chicken and Negra Modelo or Modelo Especial (required)"

Anyone run into something like this before?

What do you think?

:shrug7: