Oh man... My apologies, I just went back upwards and re-read your original question, and somehow I missed 'lasersteel'... Now I feel bad!

I'm sure Marco will take it back but I feel bad for having you order the wrong material...

The laser STEEL is on the next page, 38 (2017 catalog) bottom of the page 'brass plated steel engraving stock' - part number H125-2 --

HOWEVER-- As penance for my goof, I'll buy one sheet of the gold you DID get, specifically for you to try out.
I'll even cover your shipping costs to ship the other back if it doesn't come out gold enough and you end up buying the lasersteel.

This way, you can see if it works before you send it all back. I'm curious to see if it DOES work now, I'm hoping LaserIt was aware of the problem and resolved it!